SPEED-836: Deprecate Auto Minify settings

[aseure]

This commit deprecates the settings for the Auto Minify feature whose sunset date is set to August 8th, 2024.

After this date, it will not be able for the users of the Cloudflare dashboard, Terraform provider to change that setting.

Automatic migration of user configuration can be handled with Grit:

grit apply \
  github.com/cloudflare/terraform-provider-cloudflare#cloudflare_zone_settings_override_remove_minify

[github-actions]

changelog detected ✅

[jacobbednarz]

acceptance tests all passing

TF_ACC=1 go test ./internal/sdkv2provider -v -run "^(TestAccCloudflareZoneSettingsOverride|TestCloudflareZoneSettingsOverride)" -count 1 -timeout 120m -parallel 1
=== RUN   TestAccCloudflareZoneSettingsOverride_Full
--- PASS: TestAccCloudflareZoneSettingsOverride_Full (33.47s)
=== RUN   TestAccCloudflareZoneSettingsOverride_RemoveAttributes
--- PASS: TestAccCloudflareZoneSettingsOverride_RemoveAttributes (36.05s)
=== RUN   TestAccCloudflareZoneSettingsOverride_NEL
--- PASS: TestAccCloudflareZoneSettingsOverride_NEL (11.03s)
=== RUN   TestCloudflareZoneSettingsOverrideStateUpgradeV0
--- PASS: TestCloudflareZoneSettingsOverrideStateUpgradeV0 (0.00s)
=== RUN   TestCloudflareZoneSettingsOverrideStateUpgradeV1
--- PASS: TestCloudflareZoneSettingsOverrideStateUpgradeV1 (0.00s)
PASS
ok  	github.com/cloudflare/terraform-provider-cloudflare/internal/sdkv2provider	81.657s

[github-actions]

This functionality has been released in v4.39.0 of the Terraform Cloudflare Provider.

Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!