Tidy up Authorization error tests

[CraigMacomber]

Description

Ensure these tests would fail if error was not thrown, make a bit more concise.

Cleanup done while working on #24405

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[Copilot]

Pull Request Overview

This PR tidies up error tests for authorization scenarios by ensuring tests explicitly fail if an expected error isn’t thrown and by streamlining the test logic. Key changes include cleaning up unused imports and refactoring tests to use assert.throws instead of try–catch patterns.

Comments suppressed due to low confidence (1)

packages/drivers/odsp-driver/src/test/odspError.spec.ts:331

• [nitpick] The assertion message refers to 'realm' while the property being verified is 'tenantId', which can be confusing. Consider aligning the terminology for clarity.

assert.equal(error.tenantId, "6c482541-f706-4168-9e58-8e35a9992f58", "realm should be extracted from response");