Remove validation on use_default_background attribute

[jonathanfuller-pingidentity]

Change Description

CDI-475

Fixes error when importing pingone_branding_theme where use_default_background and either background_color or background_image have values. Because the default branding theme has use_default_background configured along with background_color, opted to remove validation from use_default_background altogether. Since this is less restrictive, it should not break any existing Terraform-managed configurations.

Change Characteristics

• This PR contains beta functionality
• This PR requires introduction of breaking changes
• No changelog entry is needed

Checklist

All full (or complete) PRs that need review prior to merge should have the following box checked.

If contributing a partial or incomplete change (expecting the development team to complete the remaining work) please leave the box unchecked

• Check to confirm: I have performed a review of my PR against the PR checklist and confirm that:
  • The changelog entry has been included according to the changelog process
  • Changes have proper test coverage (including regression tests)
  • Impacted resource, data source and schema descriptions have been reviewed and updated
  • Impacted resource and data source documentation HCL examples have been reviewed and updated
  • Does not introduce breaking changes (unless required to do so)
  • I am aware that changes to generated code may not be merged

Required SDK Upgrades

N/A

Testing

This PR has been tested with:

• Unit tests (please paste commands and results below)
• Acceptance tests (please paste commands and results below)
• End-to-end tests (please paste the link to the actions workflow runs)
• Not applicable (no evidences needed)

Shell Command(s)

TF_ACC=1 go test -count=1 -run='TestAccBrandingTheme' -v

Testing Results

Expand Results

=== RUN   TestAccBrandingThemeDefault_RemovalDrift
=== PAUSE TestAccBrandingThemeDefault_RemovalDrift
=== RUN   TestAccBrandingThemeDefault_Full
=== PAUSE TestAccBrandingThemeDefault_Full
=== RUN   TestAccBrandingThemeDefault_BadParameters
=== PAUSE TestAccBrandingThemeDefault_BadParameters
=== RUN   TestAccBrandingTheme_RemovalDrift
=== PAUSE TestAccBrandingTheme_RemovalDrift
=== RUN   TestAccBrandingTheme_NewEnv
=== PAUSE TestAccBrandingTheme_NewEnv
=== RUN   TestAccBrandingTheme_Full
=== PAUSE TestAccBrandingTheme_Full
=== RUN   TestAccBrandingTheme_Minimal
=== PAUSE TestAccBrandingTheme_Minimal
=== RUN   TestAccBrandingTheme_Change
=== PAUSE TestAccBrandingTheme_Change
=== RUN   TestAccBrandingTheme_ValidationChecks
=== PAUSE TestAccBrandingTheme_ValidationChecks
=== RUN   TestAccBrandingTheme_BadParameters
=== PAUSE TestAccBrandingTheme_BadParameters
=== CONT  TestAccBrandingThemeDefault_RemovalDrift
=== CONT  TestAccBrandingTheme_ValidationChecks
=== CONT  TestAccBrandingTheme_Full
=== CONT  TestAccBrandingTheme_NewEnv
=== CONT  TestAccBrandingThemeDefault_BadParameters
=== CONT  TestAccBrandingTheme_RemovalDrift
=== CONT  TestAccBrandingTheme_BadParameters
=== CONT  TestAccBrandingThemeDefault_Full
=== CONT  TestAccBrandingTheme_Minimal
=== CONT  TestAccBrandingTheme_Change
--- PASS: TestAccBrandingTheme_ValidationChecks (0.19s)
--- PASS: TestAccBrandingTheme_Minimal (3.39s)
--- PASS: TestAccBrandingTheme_Full (4.85s)
--- PASS: TestAccBrandingTheme_BadParameters (4.92s)
--- PASS: TestAccBrandingTheme_Change (9.01s)
--- PASS: TestAccBrandingTheme_NewEnv (39.26s)
--- PASS: TestAccBrandingThemeDefault_BadParameters (39.64s)
--- PASS: TestAccBrandingThemeDefault_Full (39.82s)
--- PASS: TestAccBrandingThemeDefault_RemovalDrift (65.23s)
--- PASS: TestAccBrandingTheme_RemovalDrift (68.92s)
PASS
ok      github.com/pingidentity/terraform-provider-pingone/internal/service/base        69.621s

End-to-end Tests Workflow Links

N/A

[patrickcping]

LGTM 🚀
But it likely does need a bug changelog entry with the same number as this PR since the issue implies that the user couldn't achieve valid configuration before and now they can.