Adjust image-build-android concurrency group

[skmcgrail]

Description of changes:

Concurrency groups can be problematic with similarly named branches, especially with pull_request_target, this adjusts the concurrency group so that it behaves consistently. Will make this adjustment to other workflows as I move them to pull_request_target in the future.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.24%. Comparing base (50e2393) to head (7055cb5).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2848      +/-   ##
==========================================
- Coverage   78.25%   78.24%   -0.02%     
==========================================
  Files         683      683              
  Lines      117347   117346       -1     
  Branches    16487    16487              
==========================================
- Hits        91832    91818      -14     
- Misses      24631    24644      +13     
  Partials      884      884              

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