Fixing release notes path for 2.9

[saratvemulapalli]

Description

Looks like 2.9 release notes were put in https://github.com/saratvemulapalli/job-scheduler/blob/main/release-notes/release-notes/opensearch.job-scheduler.release-notes-2.9.0.0.md which is why workflow failed to release it: https://github.com/opensearch-project/job-scheduler/actions/runs/5649165701/job/15302930573

Also fixed main build broken due to: opensearch-project/OpenSearch#8636

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

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[joshpalis]

This will need a rebase after the sample extension BWC version is bumped up to 2.10.0, BWC tests are currently failing due to main still using 2.9

[saratvemulapalli]

This will need a rebase after the sample extension BWC version is bumped up to 2.10.0, BWC tests are currently failing due to main still using 2.9

Yup just rebased with main.

[codecov]

Codecov Report

Merging #432 (de0edff) into main (acae28c) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #432   +/-   ##
=========================================
  Coverage     29.19%   29.19%           
  Complexity       98       98           
=========================================
  Files            22       22           
  Lines          1185     1185           
  Branches        109      109           
=========================================
  Hits            346      346           
  Misses          818      818           
  Partials         21       21