Updated deep-link creation logic in tab-request-approval.

[pankajmunde12]

Hi @VaraPrasad-MSFT @Pawank-MSFT
I figured out that in tab-request-approval app, the logic that creates a deep link for activity notification, was using "installation-id". But as per the Microsoft documentation, we need to use the app-id in the deep-link.
Also, the property 'teamsApp' needs to be replaced with 'teamsAppDefinition'. (Kindly check the changes in Files-Changed section of this PR.

Please refer to this article by the Microsoft:
https://learn.microsoft.com/en-us/microsoftteams/platform/concepts/build-and-test/deep-link-application?tabs=teamsjs-v2#configure-deep-link-to-browse-within-your-app-manually

After this change I am able to view the request details when I click on the activity notification in Teams.

The link generated by the old logic:
https://teams.microsoft.com/l/entity/**NWNjMTM0YzYtMjZjYy00MTY3LWI2NmItM2MwOWFhMzUwYjFlIyMxLjAuMCMjUHVibGlzaGVk**/request?context={"subEntityId":"8afee96e-b5cf-4afe-9534-fbf1f7fc2dbf"}

The link generated by the new logic:
https://teams.microsoft.com/l/entity/**4d2f0656-0c42-4c76-8f18-3796f4c37f0f**/request?context={"subEntityId":"21281529-4ce7-41f4-a906-8d87e40b3632"}