BUGS-351: Use DLP entry names as the set key

[OrionNebula]

Added a custom hash function to the entries set on the cloudflare_dlp_profile resource, which should give entries stable identifiers and prevent spurious plans. Updated acceptance test to check for spurious plans.

[github-actions]

changelog detected ✅

[jacobbednarz]

acceptance tests look good, thanks @OrionNebula

TF_ACC=1 go test ./internal/sdkv2provider -v -run "^TestAccCloudflareDLPProfile_" -count 1 -timeout 120m -parallel 1
=== RUN   TestAccCloudflareDLPProfile_Custom
--- PASS: TestAccCloudflareDLPProfile_Custom (8.01s)
=== RUN   TestAccCloudflareDLPProfile_Custom_MultipleEntries
--- PASS: TestAccCloudflareDLPProfile_Custom_MultipleEntries (7.76s)
=== RUN   TestAccCloudflareDLPProfile_CustomWithAllowedMatchCount
--- PASS: TestAccCloudflareDLPProfile_CustomWithAllowedMatchCount (8.01s)
PASS
ok  	github.com/cloudflare/terraform-provider-cloudflare/internal/sdkv2provider	24.240s

[github-actions]

This functionality has been released in v4.24.0 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!