[Google-TI-Feeds] Add a prometheus counter for api calls

[jabesq]

Proposed changes

• Add a prometheus counter for api calls, this will help to measure the impact of the change that will fix issue [Google TI] Reduce quota usage by resolving related entities #6236

Related issues

• Related-to [Google TI] Reduce quota usage by resolving related entities #6236
• Closes [Google TI] Add metrics about API call usage #6306

Checklist

• I consider the submitted work as finished
• I have signed my commits using GPG key.
• I tested the code for its functionality using different use cases
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality

Further comments

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 14.33%. Comparing base (eda9343) to head (c7e1813).
✅ All tests successful. No failed tests found.

❗ There is a different number of reports uploaded between BASE (eda9343) and HEAD (c7e1813). Click for more details.

HEAD has 93 uploads less than BASE

Flag	BASE (eda9343)	HEAD (c7e1813)
connectors	95	2

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #6307       +/-   ##
===========================================
- Coverage   40.58%   14.33%   -26.25%     
===========================================
  Files        2141     1705      -436     
  Lines      128285   108578    -19707     
===========================================
- Hits        52064    15569    -36495     
- Misses      76221    93009    +16788     

Flag	Coverage Δ
baseline	0.00% <0.00%> (ø)
connectors	92.59% <100.00%> (+18.40%)	⬆️

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[Powlinett]

Works as expected ✅️