Make Git ignore plugin-descriptor.properties file

[cliu123]

Signed-off-by: cliu123 lc12251109@gmail.com

Description

[Describe what this change achieves]

• Category (Enhancement, New feature, Bug fix, Test fix, Refactoring, Maintenance, Documentation) Maintenance
• Why these changes are required? plugin-descriptor.properties is not needed in version contol.
• What is the old behavior before changes and new behavior after changes? No behavior changes

Issues Resolved

#1650

Is this a backport? If so, please add backport PR # and/or commits #
Not a backport

Testing

• Tested on local: plugin-descriptor.properties is not captured by Git.
• UTs

Check List

• New functionality includes testing
• New functionality has been documented
• Commits are signed per the DCO using --signoff

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.

[codecov-commenter]

Codecov Report

Merging #1651 (d39dbb5) into main (d3c10b3) will decrease coverage by 0.53%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main    #1651      +/-   ##
============================================
- Coverage     64.59%   64.05%   -0.54%     
+ Complexity     3214     3187      -27     
============================================
  Files           247      247              
  Lines         17352    17350       -2     
  Branches       3082     3073       -9     
============================================
- Hits          11208    11114      -94     
- Misses         4594     4685      +91     
- Partials       1550     1551       +1     

Impacted Files	Coverage Δ
...mazon/dlic/auth/http/jwt/HTTPJwtAuthenticator.java	9.43% <0.00%> (-75.48%)	⬇️
...ava/com/amazon/dlic/auth/ldap2/MakeJava9Happy.java	39.13% <0.00%> (-4.35%)	⬇️
.../org/opensearch/security/support/ConfigHelper.java	80.39% <0.00%> (-1.97%)	⬇️
...com/amazon/dlic/auth/ldap2/PrivilegedProvider.java	49.18% <0.00%> (-1.64%)	⬇️
...security/configuration/DlsFlsFilterLeafReader.java	59.76% <0.00%> (-0.71%)	⬇️
.../org/opensearch/security/auth/BackendRegistry.java	58.85% <0.00%> (-0.53%)	⬇️
...ic/auth/ldap/backend/LDAPAuthorizationBackend.java	57.57% <0.00%> (-0.38%)	⬇️
...zon/dlic/auth/ldap2/LDAPAuthorizationBackend2.java	28.35% <0.00%> (-0.38%)	⬇️
...ecurity/ssl/rest/SecuritySSLReloadCertsAction.java	84.78% <0.00%> (-0.33%)	⬇️
...a/org/opensearch/security/tools/SecurityAdmin.java	47.39% <0.00%> (-0.20%)	⬇️

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