Remove unused dependencies from azure-identity

[anannya03]

Description

Addresses feedback in #47221

Removed unused jetty, redisson, and lettuce-core dependencies from azure-identity.

All SDK Contribution checklist:

• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
• I have read the contribution guidelines.

General Guidelines and Best Practices

• Title of the pull request is clear and informative.
• There are a small number of commits, each of which have an informative message. This means that previously merged commits do not appear in the history of the PR. For more information on cleaning up the commits in your PR, see this page.

Testing Guidelines

• Pull request includes test coverage for the included changes.

[Copilot]

Pull Request Overview

This PR removes unused Redis-related dependencies (jedis, lettuce-core, and redisson) from the azure-identity module's test scope. These dependencies appear to have been used for sample code demonstrating Azure Identity integration with Redis clients, but that code has been removed.

• Removed three Redis client library dependencies from the pom.xml (jedis, lettuce-core, redisson)
• Cleaned up spotbugs exclusions for Redis-related sample classes

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
sdk/identity/azure-identity/pom.xml	Removed three test-scoped Redis client dependencies (jedis 6.2.0, lettuce-core 6.8.1.RELEASE, redisson 3.51.0)
sdk/identity/azure-identity/spotbugs-exclude.xml	Removed spotbugs exclusions for Redis-related sample classes that are no longer present

Comments suppressed due to low confidence (1)

sdk/identity/azure-identity/spotbugs-exclude.xml:59

• Incomplete cleanup: The reference to com.azure.jedis.Authenticator at line 59 should also be removed. This class reference appears in a separate <Match> block for the UL_UNRELEASED_LOCK_EXCEPTION_PATH bug pattern and should be removed along with the other jedis-related exclusions.

    <Class name="com.azure.jedis.Authenticator" />

[joshfree]

Add this to the CHANGELOG.md for the identity SDK :)