Add unit tests for scripts/compute-tags.sh

[yurishkuro]

Which problem is this PR solving?

• To address [Bug]: jaegertracing/all-in-one:latest does not match the latest Docker versioned tag nor the latest git tag #5721, add unit tests first

Description of the changes

• Add unit tests and call them from scripts linting workflow
• Minor refactoring of scripts/compute-tags.sh to make it easier to read

How was this change tested?

$ GREP=ggrep SHUNIT2=/Users/ysh/dev/shunit2 bash scripts/compute-tags.test.sh
testRequireImageName
testRequireBranch
testRequireGithubSha
testRandomBranch
   Actual: --tag docker.io/foo/bar --tag quay.io/foo/bar --tag docker.io/foo/bar:latest --tag quay.io/foo/bar:latest --tag docker.io/foo/bar-snapshot:sha --tag quay.io/foo/bar-snapshot:sha --tag docker.io/foo/bar-snapshot:latest --tag quay.io/foo/bar-snapshot:latest
   checking foo/bar
   checking foo/bar:latest
   checking foo/bar-snapshot:sha
   checking foo/bar-snapshot:latest
testMainBranch
   Actual: --tag docker.io/foo/bar --tag quay.io/foo/bar --tag docker.io/foo/bar:latest --tag quay.io/foo/bar:latest --tag docker.io/foo/bar-snapshot:sha --tag quay.io/foo/bar-snapshot:sha --tag docker.io/foo/bar-snapshot:latest --tag quay.io/foo/bar-snapshot:latest
   checking foo/bar
   checking foo/bar:latest
   checking foo/bar-snapshot:sha
   checking foo/bar-snapshot:latest
testSemVerBranch
   Actual: --tag docker.io/foo/bar --tag quay.io/foo/bar --tag docker.io/foo/bar:1.2.3 --tag quay.io/foo/bar:1.2.3 --tag docker.io/foo/bar:1.2 --tag quay.io/foo/bar:1.2 --tag docker.io/foo/bar:1 --tag quay.io/foo/bar:1 --tag docker.io/foo/bar-snapshot:sha --tag quay.io/foo/bar-snapshot:sha --tag docker.io/foo/bar-snapshot:latest --tag quay.io/foo/bar-snapshot:latest
   checking foo/bar
   checking foo/bar:1
   checking foo/bar:1.2
   checking foo/bar:1.2.3
   checking foo/bar-snapshot:sha
   checking foo/bar-snapshot:latest

Ran 6 tests.

OK

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.65%. Comparing base (5bf667e) to head (7bae809).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5780      +/-   ##
==========================================
- Coverage   96.67%   96.65%   -0.03%     
==========================================
  Files         342      342              
  Lines       16519    16519              
==========================================
- Hits        15970    15966       -4     
- Misses        360      363       +3     
- Partials      189      190       +1     

Flag	Coverage Δ
badger_v1	8.05% <ø> (ø)
badger_v2	1.81% <ø> (ø)
cassandra-3.x-v1	16.61% <ø> (ø)
cassandra-3.x-v2	1.74% <ø> (ø)
cassandra-4.x-v1	16.61% <ø> (ø)
cassandra-4.x-v2	1.74% <ø> (ø)
elasticsearch-6.x-v1	18.77% <ø> (-0.02%)	⬇️
elasticsearch-7.x-v1	18.84% <ø> (+0.01%)	⬆️
elasticsearch-8.x-v1	19.03% <ø> (ø)
elasticsearch-8.x-v2	1.81% <ø> (ø)
grpc_v1	9.52% <ø> (ø)
grpc_v2	7.14% <ø> (ø)
kafka	9.74% <ø> (ø)
memory_v2	1.81% <ø> (ø)
opensearch-1.x-v1	18.88% <ø> (ø)
opensearch-2.x-v1	18.89% <ø> (ø)
opensearch-2.x-v2	1.80% <ø> (ø)
unittests	95.07% <ø> (-0.03%)	⬇️

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