Update Service Fabric managed identity API version to 2020-05-01

[Copilot]

Stable MSAL releases were requesting the 2019-07-01-preview Service Fabric managed identity API. A compatible GA version (2020-05-01) is available and safe to use unconditionally — Service Fabric 7.1 (last version without this support) reached end-of-life in 2021.

Changes proposed in this request

• ServiceFabricManagedIdentitySource.cs: Update ServiceFabricMsiApiVersion constant from "2019-07-01-preview" → "2020-05-01"
• MockHttpManagerExtensions.cs: Update test mock to expect the new API version

Testing
Existing Service Fabric managed identity unit tests cover this change with no modifications needed beyond the mock update.

Performance impact
None.

Documentation

• All relevant documentation is updated.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Update Service Fabric managed identity API version to 2020-05-01</issue_title>
<issue_description>Clients currently specify version 2019-07-01-preview. This is awkward because it means stable versions of MSAL request a preview service version. There's a compatible stable version MSAL can specify instead: 2020-05-01. Service Fabric 7.1 is the last version that didn't support this managed identity API, and support for it ended in 2021. So, it's reasonable for clients to unconditionally request the 2020-05-01 managed identity API.

We agreed to change the API version from 2019-07-01-preview to 2020-05-01</issue_description>

Comments on the Issue (you are @copilot in this section)

@bgavrilMS Shouldn't we just bump to the latest GA version @gladjohn @neha-bhargava @trwalke @bgavrilMS We discussed with Service Fabric team. Updated the spec

• Fixes Update Service Fabric managed identity API version to 2020-05-01 #5769

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