container_app_job: support secrets from Key Vault

[Botje]

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Description

This PR adds support for referencing Key Vault secrets from Container App Jobs and lifts the restriction on removing secrets.
This code is ported from the Container Apps resource.

PR Checklist

• I have followed the guidelines in our Contributing Documentation.
• I have checked to ensure there aren't other open Pull Requests for the same update/change.
• I have checked if my changes close any open issues. If so please include appropriate closing keywords below.
• I have updated/added Documentation as required written in a helpful and kind way to assist users that may be unfamiliar with the resource / data source.
• I have used a meaningful PR title to help maintainers and other users understand this change and help prevent duplicate work.
  For example: “resource_name_here - description of change e.g. adding property new_property_name_here”

Changes to existing Resource / Data Source

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• I have written new tests for my resource or datasource changes & updated any relevent documentation.
• I have successfully run tests with my changes locally. If not, please provide details on testing challenges that prevented you running the tests.
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Testing

• My submission includes Test coverage as described in the Contribution Guide and the tests pass. (if this is not possible for any reason, please include details of why you did or could not add test coverage)

Testing evidence

TF_ACC=1 go test -v ./internal/services/containerapps -run=TestAccContainerAppJob_withKeyVault -timeout 60m -ldflags="-X=github.com/hashicorp/terraform-provider-azurerm/version.ProviderVersion=acc"
=== RUN   TestAccContainerAppJob_withKeyVaultSecret
=== PAUSE TestAccContainerAppJob_withKeyVaultSecret
=== RUN   TestAccContainerAppJob_withKeyVaultSecretVersioningUpdate
=== PAUSE TestAccContainerAppJob_withKeyVaultSecretVersioningUpdate
=== RUN   TestAccContainerAppJob_withKeyVaultSecretIdentityUpdate
=== PAUSE TestAccContainerAppJob_withKeyVaultSecretIdentityUpdate
=== CONT  TestAccContainerAppJob_withKeyVaultSecret
=== CONT  TestAccContainerAppJob_withKeyVaultSecretIdentityUpdate
=== CONT  TestAccContainerAppJob_withKeyVaultSecretVersioningUpdate
--- PASS: TestAccContainerAppJob_withKeyVaultSecret (894.40s)
--- PASS: TestAccContainerAppJob_withKeyVaultSecretVersioningUpdate (974.74s)
--- PASS: TestAccContainerAppJob_withKeyVaultSecretIdentityUpdate (1019.78s)
PASS
ok  	github.com/hashicorp/terraform-provider-azurerm/internal/services/containerapps	1022.386s

Change Log

Below please provide what should go into the changelog (if anything) conforming to the Changelog Format documented here.

• container_app_job - support secrets from Key Vault [GH-0000]
• container_app_job - allow removing secrets [GH-0000]

This is a (please select all that apply):

• Bug Fix
• New Feature (ie adding a service, resource, or data source)
• Enhancement
• Breaking Change

Related Issue(s)

Fixes #25934
Fixes #25994

Note

If this PR changes meaningfully during the course of review please update the title and description as required.

[jackofallops]

Hi @Botje - We're having trouble running the tests for this PR due to some dependency changes/issues with main that have crept in somewhere. Are you able to update your fork's main and rebase to allow us to run the tests?

Scratch that - sorry - appears to have been a problem with our CI system picking up changes... will loop back asap.

[Botje]

Despite subscribing to the linked issue, I did not get a notification. I will update the tests anyway, as promised.

[Botje]

Rebased on current main branch and converted the tests to use secret and registry.

[jackofallops]

Hi @Botje - Thanks for the rebase and update. Just one minor docs change to look at and then I think this will be good to go, pending testing.

[jackofallops]

Thanks @Botje for the updates. This LGTM, I'll get the tests run now.

[jackofallops]

Tests look fine (failures are unrelated to change)

[github-actions]

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