fix: update the way how Azure OAuth2 token is validated

[tolusha]

What does this PR do?

• Request for a user profile with a current token to make sure that token is valid

Screenshot/screencast of this PR

N/A

What issues does this PR fix or reference?

eclipse-che/che#22051

How to test this PR?

N/A

PR Checklist

As the author of this Pull Request I made sure that:

• The Eclipse Contributor Agreement is valid
• Code produced is complete
• Code builds without errors
• Tests are covering the bugfix
• The repository devfile is up to date and works
• Sections What issues does this PR fix or reference and How to test this PR completed
• Relevant user documentation updated
• Relevant contributing documentation updated
• CI/CD changes implemented, documented and communicated

Reviewers

Reviewers, please comment how you tested the PR when approving it.

[ibuziuk]

LGTM, the interesting thing is that validation works initially, but starts to fail after some time

[devstudio-release]

Build 3.6 :: server_3.x/135: Console, Changes, Git Data

[devstudio-release]

Build 3.6 :: sync-to-downstream_3.x/2672: Console, Changes, Git Data

[devstudio-release]

Build 3.6 :: get-sources-rhpkg-container-build_3.x/2522: Console, Changes, Git Data

[tolusha]

LGTM, the interesting thing is that validation works initially, but starts to fail after some time

The only reason why validation was working is that the token was valid itself.