Replace all hard coded localhosts with env constant variables

[NayOoLwin5]

What kind of change does this PR introduce?

Replacement of all hard coded localhost urls in places with environment constant variables.

Issue Number:

Fixes #1244

Did you add tests for your changes?

Snapshots/Videos:

If relevant, did you update the documentation?

Yes

Summary

• With PR feat: Updated Talawa Admin to use custom port #1488 merged, I had to introduce new env variable REACT_ADMIN_FRONTEND_HOST for two test files to access host IP and port separately and wrote a prompt for it in setup
• Leaving hard coded localhost in file /src/components/AddOn/support/services/Plugin.helper.ts as I was informed it is outdated and no longer used

Does this PR introduce a breaking change?

Other information

Have you read the contributing guide?

Yes

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[Cioppolo14]

@NayOoLwin5 Please fix the test application failing tests.

[palisadoes]

1. I don't see the need to create the REACT_ADMIN_FRONTEND_HOST variable when relative variables would seem to be equally suitable.
2. Let us know why this is necessary
3. The replacement of localhost with the BACKEND_URL is clearly necessary.

[NayOoLwin5]

• I checked and found out all test files have its mock responses against the localhost. Therefore, no need of dynamic env variables. Thanks for pointing them out.
• However, running tests only with relative url resulting in failures. Thus, I kept them same as it was. Please review and let me know if anything more needed to be fixed.

@palisadoes

[palisadoes]

Please fix the failing tests

[NayOoLwin5]

• I cannot reproduce the test failures on my machine even though using node version 20.
• However, I tested the login page manually by myself and the fetch checks are working as expected with my new changes.
• No changes to the failed test files also as I changed back to previously existing code.

Please let me know how I can reproduce the failed tests. @palisadoes

[palisadoes]

1. Scroll down in the test box
2. Click on this link
3. It is explained there

[NayOoLwin5]

Hi @palisadoes, the test should work fine now. The issue was removing dynamic env BACKEND_URL variable from the test files as the value in fetch expect the same as that is parsed in fetch in the components. Added it back and let us check the test again.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c647157) 97.29% compared to head (e640521) 97.29%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1497   +/-   ##
========================================
  Coverage    97.29%   97.29%           
========================================
  Files          132      132           
  Lines         3395     3396    +1     
  Branches      1038     1038           
========================================
+ Hits          3303     3304    +1     
  Misses          87       87           
  Partials         5        5           

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