commented firebase notification code

[Veer0x1]

What kind of change does this PR introduce?
Commented the Firebase notification on creating an event, and also test corresponding to it. And also removed firebase-related installation and configuration instructions.

Issue Number:

Fixes #1500

Did you add tests for your changes?
NA

Snapshots/Videos:

If relevant, did you update the documentation?

Summary

Does this PR introduce a breaking change?

Other information

Have you read the contributing guide?
Yes

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[codecov]

Codecov Report

Attention: 91 lines in your changes are missing coverage. Please review.

Comparison is base (c0468a4) 98.17% compared to head (32e657d) 97.45%.
Report is 86 commits behind head on develop.

Files	Patch %	Lines
src/utilities/PII/decryption.ts	0.00%	17 Missing ⚠️
src/resolvers/Mutation/updateUserProfile.ts	70.90%	1 Missing and 15 partials ⚠️
src/resolvers/middleware/currentUserExists.ts	45.83%	13 Missing ⚠️
src/utilities/PII/encryption.ts	0.00%	13 Missing ⚠️
src/utilities/PII/isAuthorised.ts	0.00%	11 Missing ⚠️
...tilities/encodedVideoStorage/uploadEncodedVideo.ts	90.12%	8 Missing ⚠️
src/resolvers/Mutation/createPost.ts	86.95%	6 Missing ⚠️
src/resolvers/Mutation/removeAdvertisement.ts	92.85%	2 Missing ⚠️
...c/resolvers/Query/postsByOrganizationConnection.ts	33.33%	2 Missing ⚠️
src/resolvers/Subscription/onPluginUpdate.ts	0.00%	2 Missing ⚠️
... and 1 more

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1503      +/-   ##
===========================================
- Coverage    98.17%   97.45%   -0.73%     
===========================================
  Files          184      214      +30     
  Lines        10767    12949    +2182     
  Branches       835     1042     +207     
===========================================
+ Hits         10571    12620    +2049     
- Misses         186      299     +113     
- Partials        10       30      +20     

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[palisadoes]

The aim is to remove all references to firebase in the code base not just for creating events therefore:

1. References to firebase packages need to be removed from package.json
2. All references to firebase in the code base

[Veer0x1]

Okay got it.

[palisadoes]

Also remove references here https://github.com/PalisadoesFoundation/talawa-api/blob/develop/.env.sample

[Veer0x1]

Yup,working on it.

[Veer0x1]

Ig now, I have removed all the instances of Firebase from the codebase; please review.

[palisadoes]

1. Are you removing all Firebase references or only those related to events? If not, what other Firebase references would be left?
2. We will eventually need to remove all references.

[Abhisheksainii]

@Veer0x1 , we are also storing FCM token through mutation and asking for androidFirebaseOptions, iOSFirebaseOptions through Query.
Kindly check if these references to firebase has also been removed.

[Veer0x1]

1. Are you removing all Firebase references or only those related to events? If not, what other Firebase references would be left?
2. We will eventually need to remove all references.

In my attempt to eliminate all Firebase references, I systematically removed them and deleted the Firebase package. After running all tests, I observed that all but two tests (which were failing before also )passed successfully. Consequently, I believe I have successfully eradicated all traces of Firebase from the codebase.