Cache empty action list when no action is configured

[ashanthamara]

Proposed changes in this pull request

• Previously when no actions are configured it didn't cache the empty action list in the cache.
• Due to that reason, it requires i/o operations to fetch actions from the DB everytime.
• Caching the empty list will prevent above overhead.

Related Issue

• Cache empty action list when no action is configured product-is#23276

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[jenkins-is-staging]

PR builder started
Link: https://github.com/wso2/product-is/actions/runs/13517173276

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.26%. Comparing base (d772b63) to head (3a74147).
Report is 6 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6560      +/-   ##
============================================
- Coverage     47.30%   47.26%   -0.04%     
+ Complexity    15408    15386      -22     
============================================
  Files          1751     1751              
  Lines        105682   105682              
  Branches      19960    19960              
============================================
- Hits          49990    49949      -41     
- Misses        48621    48666      +45     
+ Partials       7071     7067       -4     

Flag	Coverage Δ
unit	30.58% <100.00%> (-0.01%)	⬇️

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[jenkins-is-staging]

PR builder completed
Link: https://github.com/wso2/product-is/actions/runs/13517173276
Status: failure

[jenkins-is-staging]

PR builder started
Link: https://github.com/wso2/product-is/actions/runs/13527107559

[jenkins-is-staging]

PR builder completed
Link: https://github.com/wso2/product-is/actions/runs/13527107559
Status: success

[jenkins-is-staging]

Approving the pull request based on the successful pr build https://github.com/wso2/product-is/actions/runs/13527107559