Cleanup dependencies by moving rubocop to check group

[TonyCTHsu]

What does this PR do?

Remove redundant dependencies required for appraisal groups.

Motivation:

Previous PR: #4198, allow us to shrink the size of Gemfile by moving default dependencies into check group, which is only used during specific situation. While those groups are used to introduce dependencies for testing integrations.

Change log entry
No

[github-actions]

Thank you for updating Change log entry section 👏

^{Visited at: 2025-01-10 14:40:11 UTC}

[datadog-datadog-prod-us1]

Datadog Report

Branch report: tonycthsu/rubocop-group
Commit report: 76c0d81
Test service: dd-trace-rb

✅ 0 Failed, 22130 Passed, 1472 Skipped, 5m 25.34s Total Time

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-01-10 15:12:01

Comparing candidate commit 76c0d81 in PR branch tonycthsu/rubocop-group with baseline commit 7f8e8fd in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 31 metrics, 2 unstable metrics.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.72%. Comparing base (7f8e8fd) to head (76c0d81).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4276      +/-   ##
==========================================
+ Coverage   97.70%   97.72%   +0.01%     
==========================================
  Files        1354     1354              
  Lines       82418    82418              
  Branches     4220     4220              
==========================================
+ Hits        80530    80543      +13     
+ Misses       1888     1875      -13     

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