chore: migrate to base datadog-ci package

[ava-silver]

What does this PR do?

Replaces the @datadog/datadog-ci dependency with @datadog/datadog-ci-base, which is the lighter-weight core package without the full CLI and all plugins bundled in.

Motivation

@datadog/datadog-ci is a large package (~75 MB unpacked including all plugins). We only use two functions from it (getGitCommitInfo and uploadGitCommitHash), both of which are available in @datadog/datadog-ci-base. Switching reduces the @datadog portion of node_modules from 75 MB → 7.2 MB (~90% reduction).

Testing Guidelines

Existing tests cover the git metadata upload path. No behavior changes.

Additional Notes

The plugin's own published package size is unchanged (66.4 kB packed) since dependencies are not bundled. The reduction is in install footprint for consumers.

Types of changes

• Bug fix
• New feature
• Breaking change
• Misc (docs, refactoring, dependency upgrade, etc.)

Check all that apply

• This PR's description is comprehensive
• This PR contains breaking changes that are documented in the description
• This PR introduces new APIs or parameters that are documented and unlikely to change in the foreseeable future
• This PR impacts documentation, and it has been updated (or a ticket has been logged)
• This PR's changes are covered by the automated tests
• This PR collects user input/sensitive content into Datadog

[ava-silver]

• chore: migrate to base datadog-ci package #699 👈 (View in Graphite)
• main

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 77.69%. Comparing base (62004bb) to head (e53d975).

Files with missing lines	Patch %	Lines
src/index.ts	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #699      +/-   ##
==========================================
- Coverage   78.14%   77.69%   -0.45%     
==========================================
  Files          12       12              
  Lines        1112     1112              
  Branches      350      350              
==========================================
- Hits          869      864       -5     
- Misses        113      118       +5     
  Partials      130      130              

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