[Feature/Identity] Switch to smaller license header

[peternied]

Description

Switch to smaller license header

Background on this change opensearch-project/alerting#136 (comment)

Signed-off-by: Peter Nied petern@amazon.com

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff
• Commit changes are listed out in CHANGELOG.md file (See: Changelog)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/3648/
• CommitID: 3981380

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/3649/
• CommitID: 4d8d877

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: SUCCESS ✅
• URL: https://build.ci.opensearch.org/job/gradle-check/3652/
• CommitID: 4d8d877

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (feature/identity@7a687fd). Click here to learn what that means.
The diff coverage is n/a.

@@                 Coverage Diff                 @@
##             feature/identity    #4657   +/-   ##
===================================================
  Coverage                    ?   70.53%           
  Complexity                  ?    57522           
===================================================
  Files                       ?     4656           
  Lines                       ?   276992           
  Branches                    ?    40511           
===================================================
  Hits                        ?   195366           
  Misses                      ?    65234           
  Partials                    ?    16392           

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[peternied]

@cwperks @scrawfor99 @DarshitChanpura Could I get a quick review?