Write tests for access_request_screen.dart

[SatwikMohan]

What kind of change does this PR introduce?

This change included the Unittest for access_request_screen.dart

Issue Number: #2151

Fixes https: #2151

Did you add tests for your changes?

Yes I have added tests

Summary

Tests for access_request_screen are created for which files access_request_screen_test.dart, access_request_screen_test.mocks.dart are created

Does this PR introduce a breaking change?

No, this does not introduce any major changes to the codebase.

Have you read the contributing guide?

Yes, I have followed the guidelines.

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