Allow both current and previous major platform versions in manifest validation

[Copilot]

Manifest validation was rejecting app.json files with a platform version from the previous major (e.g. 28.0.0.0) when the repo is on the current major (e.g. 29.0), blocking valid PRs targeting releases/28.x.

Changes

• action.ps1: Replace single $expectedPlatformVersion (derived from repoVersion major.minor) with two explicit versions — $expectedPlatformVersionCurrent and $expectedPlatformVersionPrevious — passed as an array:

  $currentMajor = [int]($currentMajorMinor -split '\.')[0]
  $expectedPlatformVersionCurrent = "$currentMajor.0.0.0"
  $expectedPlatformVersionPrevious = "$($currentMajor - 1).0.0.0"
  Test-ApplicationManifests ... -ExpectedPlatformVersions @($expectedPlatformVersionCurrent, $expectedPlatformVersionPrevious)

• AppObjectValidation.psm1: Updated Test-ApplicationManifests to accept [string[]] $ExpectedPlatformVersions and use -notin for the platform check. Error message now lists all allowed versions.

Original prompt

Fix platform version validation in .github/actions/TestObjectIdsAndManifests/action.ps1. Currently, it only allows a single platform version of "$currentMajorMinor.0.0", but validation expects either "currentMajor.0.0.0" or "(currentMajor-1).0.0.0".

Steps:

1. Change the logic so $expectedPlatformVersion can accept both valid platform versions: "$currentMajor.0.0.0" and "($currentMajor-1).0.0.0".
2. Update how $currentMajor is assigned, using "repoVersionMajor" as config key.
3. Construct $expectedPlatformVersionCurrent and $expectedPlatformVersionPrevious for the two allowed versions.
4. Pass both the allowed platform versions to Test-ApplicationManifests.

This should resolve manifest validation errors for PR #6921.

This pull request was created from Copilot chat.

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AB#623973