Add support for markdownlint-cli2

[det]

This pull request introduces a new linter, markdownlint-cli2, and updates the documentation and configuration files accordingly. The most important changes include adding the new linter to the README.md, creating configuration and test files for markdownlint-cli2, and updating existing linter configurations.

Introduction of markdownlint-cli2:

• Configuration and Test Files:
  • Created a basic test for markdownlint-cli2 in linters/markdownlint-cli2/markdownlint.test.ts.
  • Defined the markdownlint-cli2 tool and its configurations in linters/markdownlint-cli2/plugin.yaml.
  • Added a JSON configuration file for markdownlint-cli2 in linters/markdownlint-cli2/test_data/.markdownlint-cli2.jsonc.
  • Provided test data and expected output for markdownlint-cli2 in linters/markdownlint-cli2/test_data/basic.in.md and linters/markdownlint-cli2/test_data/markdownlint_cli2_v0.14.0_basic.check.shot. [1] [2]

Documentation Updates:

• README.md:
  • Updated the Markdown linters list to include markdownlint-cli2 in README.md.

Removal of Old Configurations:

• Old Linter Configurations:
  • Removed outdated markdownlint-cli2 configurations from linters/markdownlint/plugin.yaml.

[trunk-io]

⏱️ 30m total CI duration on this PR

Job	Cumulative Duration	Recent Runs
Linter Tests ubuntu-latest	7m	🟩 🟩 🟩
Windows Linter Tests	7m	🟩 🟩 🟩
Trunk Check runner [linux]	5m	🟩 🟩 🟩
Linter Tests macOS	5m	🟩 🟩 🟩
CodeQL-Build	4m	🟩 🟩 🟩
Repo Tests / Plugin Tests	2m	🟩 🟩 🟩
Detect changed files	22s	🟩 🟩 🟩
Aggregate Test Results	5s	🟩 🟩 🟩

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[trunk-staging-io]

✅ 8 passed ⋅ (learn more)

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[TylerJang27]

One callout

[TylerJang27]

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