Fix duplicate logging of MsalUiRequiredException

[armin-azar]

Fix duplicate logging of MsalUiRequiredException

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Summary of the changes (Less than 80 chars)

Stop double-logging MsalUiRequiredException

Description

MsalUiRequiredException is already logged internally by MSAL.NET at error
level. Microsoft.Identity.Web additionally logged the same exception via
Logger.TokenAcquisitionError in two places in TokenAcquisition.cs, both
of which only rethrow/wrap the exception (no recovery logic depends on the
log call). This produced two log entries for a single MsalUiRequiredException,
as described in the issue.

This PR removes the redundant logging calls in those two catch blocks and
adds a comment explaining why nothing is logged there. All other
Logger.TokenAcquisitionError call sites (which handle exceptions MSAL does
not already log, e.g. certificate retry) are unchanged.

Added a unit test that reproduces the scenario from the issue (AcquireTokenSilent
called with no account/login hint, which MSAL throws MsalUiRequiredException for
synchronously) and asserts the log is not emitted.

Fixes #3528

[armin-azar]

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[iarekk]

/azp run

[azure-pipelines]

No pipelines are associated with this pull request.

[iarekk]

/azp run Microsoft-identity-web PR (YAML)

[azure-pipelines]

No pipelines are associated with this pull request.

[iarekk]

Opened #3941 as an in-repo copy of this PR so the �zure-pipelines PR pipeline runs natively (fork PRs don't trigger it, and the required check is enforced by an enterprise ruleset that admin merge can't bypass). Your commits and authorship are preserved unchanged in #3941. This PR will be closed as landed once #3941 merges.

[iarekk]

Landed via in-repo copy #3941 (squash-merged), which preserves your original commits and authorship. Thanks @armin-azar! Closing this PR as completed.