Remove dependency on /user and /profile API

[akurinnoy]

What does this PR do?

This PR removes the dependency on /user and /profile che-server API. Instead, the dashboard backend gets a new endpoint /userprofile that allows retrieving the email and username. Additionally, the Account page gets temporarily hidden as it will be reworked in further PRs.

What issues does this PR fix or reference?

resolves eclipse-che/che#21595

[che-bot]

Click here to review and test in web IDE:

[github-actions]

Docker image build succeeded: quay.io/eclipse/che-dashboard:pr-657

[che-bot]

Click here to review and test in web IDE:

[github-actions]

Docker image build succeeded: quay.io/eclipse/che-dashboard:pr-657

[che-bot]

Click here to review and test in web IDE:

[github-actions]

Docker image build succeeded: quay.io/eclipse/che-dashboard:pr-657

[olexii4]

LGTM

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: akurinnoy, olexii4

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[openshift-ci]

New changes are detected. LGTM label has been removed.

[che-bot]

Click here to review and test in web IDE:

[github-actions]

Docker image build succeeded: quay.io/eclipse/che-dashboard:pr-657

[openshift-ci]

@akurinnoy: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/v10-dashboard-happy-path	545965c	link	true	/test v10-dashboard-happy-path

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