fix: remove MutationObserver and make polyfill checks consistent

[saikumarrs]

PR Description

• Removed MutationObserver polyfill as it's unused.
• Made all the polyfill detection checks consistent.

Linear task (optional)

https://linear.app/rudderstack/issue/SDK-1589/remove-mutationobserver-polyfill-js-sdk

Cross Browser Tests

Please confirm you have tested for the following browsers:

• Chrome
• Firefox
• IE11

Sanity Suite

• All sanity suite test cases pass locally

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

[coderabbitai]

Walkthrough

The recent updates focus on refining polyfill configurations and improving issue templates for bug reports and feature requests. Additionally, adjustments in the detection capabilities for the analytics SDK enhance compatibility with modern web technologies. These changes streamline developer interactions and ensure the SDK remains robust across diverse environments.

Changes

File Path	Change Summary
.eslintrc.json	Updated polyfills, adding several new items while removing Promise and Element.prototype.dataset.
.github/ISSUE_TEMPLATE/...	Modified assignees and restructured templates for bug reports and feature requests.
packages/analytics-js/src/.../dom.ts	Revised detection checks, removing some and adding others like URLSearchParams and TextEncoder. Consistency improved with isFunction usage.

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In code and doc, it's spun.
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---

Recent Review Details

Configuration used: CodeRabbit UI

Commits

Files that changed from the base of the PR and between 56e34be and e2db1ef.

Files selected for processing (4)

• .eslintrc.json (2 hunks)
• .github/ISSUE_TEMPLATE/bug_report.md (2 hunks)
• .github/ISSUE_TEMPLATE/feature_request.md (1 hunks)
• packages/analytics-js/src/components/capabilitiesManager/detection/dom.ts (1 hunks)

Additional comments not posted (8)

.github/ISSUE_TEMPLATE/feature_request.md (1)

6-6: Change in default assignee to rudderlabs/js-sdk is appropriate for streamlining issue management.

.github/ISSUE_TEMPLATE/bug_report.md (2)

6-6: Change in default assignee to rudderlabs/js-sdk is appropriate for streamlining issue management.

---

28-38: Reorganization of additional information sections improves clarity and detail in bug reporting.

packages/analytics-js/src/components/capabilitiesManager/detection/dom.ts (3)

24-26: Removal of unused polyfill checks (Object.entries, Object.values, Object.assign) aligns with optimization objectives.

---

12-30: Addition of new polyfill checks enhances compatibility and functionality across different environments.

---

12-36: Standardizing the method to use isFunction for all polyfill checks improves consistency and maintainability.

.eslintrc.json (2)

19-30: Additions to the polyfills array ensure that linting covers new features used in the code.

---

10-10: Removal of Promise from the polyfills array is consistent with the changes in the codebase.

---

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.92%. Comparing base (56e34be) to head (e2db1ef).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1688      +/-   ##
===========================================
- Coverage    53.93%   53.92%   -0.01%     
===========================================
  Files          461      461              
  Lines        15616    15615       -1     
  Branches      3109     3100       -9     
===========================================
- Hits          8422     8421       -1     
- Misses        5840     5869      +29     
+ Partials      1354     1325      -29     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[github-actions]

size-limit report 📦

Name	Size (Base)	Size (Current)	Size Limit	Status
Common Code - No bundling	15.81 KB	15.81 KB (0%)	16.5 KB	✅
Remote Module Federation Mapping - CDN	330 B	330 B (0%)	512 B	✅
Remote Module Federated Plugins - CDN	5.71 KB	5.71 KB (0%)	6 KB	✅
Core ESM - NPM	7.64 KB	7.64 KB (0%)	8 KB	✅
Core CJS - NPM	22.45 KB	22.45 KB (+0.03% ▲)	23 KB	✅
Core - NPM	22.55 KB	22.54 KB (-0.05% ▼)	23 KB	✅
Core Legacy - CDN	42.99 KB	42.97 KB (-0.05% ▼)	44 KB	✅
Core - CDN	22.71 KB	22.71 KB (-0.01% ▼)	23 KB	✅
Core (legacy build) - CDN - v1.1	31.55 KB	31.55 KB (0%)	32 KB	✅
Core - NPM - v1.1	31.53 KB	31.53 KB (0%)	32 KB	✅
Service Worker Module	22.64 KB	22.64 KB (0%)	24 KB	✅
All Integrations (legacy build) - CDN	98.6 KB	98.6 KB (0%)	105 KB	✅