refactor(cli): remove unused v1 bootstrapping detection

[mrgrain]

Reason for this change

Removing dead code in determineV1BootstrapSource which could not be called anymore since version always returns v2 these days.

Description of changes

Remove the dead code and conditional.
Also slightly changes the contract of CliToolkit.bootstrap() to take a BootstrapSource as part of options, instead of a the Bootstrapper.

Describe any new or updated permissions being added

n/a

Description of how you validated changes

existing tests and integ tests

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

---

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[aws-cdk-automation]

The pull request linter has failed. See the aws-cdk-automation comment below for failure reasons. If you believe this pull request should receive an exemption, please comment and provide a justification.

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[aws-cdk-automation]

➡️ PR build request submitted to test-main-pipeline ⬅️

A maintainer must now check the pipeline and add the pr-linter/cli-integ-tested label once the pipeline succeeds.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.49%. Comparing base (189bae3) to head (472059f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #32606      +/-   ##
==========================================
+ Coverage   80.41%   80.49%   +0.07%     
==========================================
  Files         106      106              
  Lines        6955     6957       +2     
  Branches     1288     1289       +1     
==========================================
+ Hits         5593     5600       +7     
+ Misses       1183     1178       -5     
  Partials      179      179              

Flag	Coverage Δ
suite.unit	80.49% <100.00%> (+0.07%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
packages/aws-cdk	80.49% <100.00%> (+0.07%)	⬆️

✅ Updated pull request passes all PRLinter validations. Dismissing previous PRLinter review.

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 472059f
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[mergify]

This pull request has been removed from the queue for the following reason: pull request dequeued.

Pull request #32606 has been dequeued. The pull request could not be merged. This could be related to an activated branch protection or ruleset rule that prevents us from merging. (detail: 4 of 6 required status checks are expected.).

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[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

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