Automation component release issue: Fix label add bug

[prudhvigodithi]

Description

Coming from main PR #3708
#3795
This fixes the bugs fixes the following error

Created issue #1519
Applying labels 'v2.10.0'
Error: Resource not accessible by integration

Notice the error is thrown to add the label for the created release issue, following the documentation https://github.com/peter-evans/create-issue-from-file the labels should be added as A comma or newline-separated list of labels.

Issues Resolved

Part of:
#3349
#3676
opensearch-project/.github#167

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[codecov]

Codecov Report

Merging #3797 (3604bae) into main (2f606d6) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #3797   +/-   ##
=======================================
  Coverage   91.54%   91.54%           
=======================================
  Files         182      182           
  Lines        5420     5420           
=======================================
  Hits         4962     4962           
  Misses        458      458