Add instance discovery to 2.54.0 history notes

[jiasli]

Azure/azure-cli#27494 added a history note for instance discovery to Core: https://github.com/Azure/azure-cli/blob/dev/src/azure-cli-core/HISTORY.rst#2540

[Core] [PREVIEW] Support disabling instance discovery by running `az config set core.instance_discovery=false`

But currently the release pipeline doesn't include core changes, so we have to manually copy them (similar to #2815)

[learn-build-service-prod]

Learn Build status updates of commit 1273c99:

⚠️ Validation status: warnings

File	Status	Preview URL	Details
docs-ref-conceptual/release-notes-azure-cli.md	⚠️Warning	View	Details

docs-ref-conceptual/release-notes-azure-cli.md

• Line 832, Column 1: [Warning: duplicate-h2s - See documentation] Duplicate heading: 'H2 'April 25, 2023''. Each second level heading (H2) in an article must be unique.
• Line 840, Column 1: [Warning: duplicate-h2s - See documentation] Duplicate heading: 'H2 'April 25, 2023''. Each second level heading (H2) in an article must be unique.
• Line 1201, Column 1: [Warning: disallowed-heading - See documentation] Heading 'H3 'Feedback'' matches the text of a disallowed Docs template heading.
• Line 1793, Column 1: [Warning: disallowed-heading - See documentation] Heading 'H3 'Feedback'' matches the text of a disallowed Docs template heading.

For more details, please refer to the build report.

Note: Your PR may contain errors or warnings or suggestions unrelated to the files you changed. This happens when external dependencies like GitHub alias, Microsoft alias, cross repo links are updated. Please use these instructions to resolve them.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[dbradish-microsoft]

@jiasli, Can this PR be closed or merged?

[dbradish-microsoft]

@jiasli, This PR is almost 6 months old. Please move it back to Draft so it doesn't get closed in June 2024 as part of my PR cleanup process. Thank you.

[learn-build-service-prod]

Learn Build status updates of commit 1273c99:

⚠️ Validation status: warnings

File	Status	Preview URL	Details
docs-ref-conceptual/release-notes-azure-cli.md	⚠️Warning	View	Details

docs-ref-conceptual/release-notes-azure-cli.md

• Line 2143, Column 1: [Warning: duplicate-h2s - See documentation] Duplicate heading: 'H2 'April 25, 2023''. Each second level heading (H2) in an article must be unique.
• Line 2151, Column 1: [Warning: duplicate-h2s - See documentation] Duplicate heading: 'H2 'April 25, 2023''. Each second level heading (H2) in an article must be unique.
• Line 2512, Column 1: [Warning: disallowed-heading - See documentation] Heading 'H3 'Feedback'' matches the text of a disallowed Docs template heading.
• Line 3104, Column 1: [Warning: disallowed-heading - See documentation] Heading 'H3 'Feedback'' matches the text of a disallowed Docs template heading.

For more details, please refer to the build report.

Note: Your PR may contain errors or warnings or suggestions unrelated to the files you changed. This happens when external dependencies like GitHub alias, Microsoft alias, cross repo links are updated. Please use these instructions to resolve them.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel