feat(workers): add write-only secret support for Access IdP and bindings

[jeszican]

• I understand that this repository is auto-generated and my pull request may not be merged

Changes being requested

Add write-only support for secret-bearing fields while preserving backwards compatibility:

• cloudflare_zero_trust_access_identity_provider
  • add config.client_secret_wo (write-only, sensitive)
  • add config.client_secret_wo_version
  • prefer client_secret_wo when constructing create/update payloads
• cloudflare_workers_script and cloudflare_worker_version
  • add bindings[*].text_wo (write-only, sensitive)
  • add bindings[*].text_wo_version
  • map text_wo into API payload text for create/update
• keep legacy secret fields (client_secret, text) and enforce conflict validation between legacy and _wo fields
• update docs for all new attributes

Acceptance test run results

• I have added or updated acceptance tests for my changes
• I have run acceptance tests for my changes and included the results below

Steps to run acceptance tests

Targeted package tests used for this change:

go test ./internal/services/zero_trust_access_identity_provider ./internal/services/workers_script ./internal/services/worker_version

Test output

ok  github.com/cloudflare/terraform-provider-cloudflare/internal/services/zero_trust_access_identity_provider  1.828s
ok  github.com/cloudflare/terraform-provider-cloudflare/internal/services/workers_script                        3.269s
ok  github.com/cloudflare/terraform-provider-cloudflare/internal/services/worker_version                        2.600s

Additional context & links

• SKIP_BREW=1 ./scripts/bootstrap and ./scripts/build dev both succeed locally.
• ./scripts/test (go test -v ./...) is long-running in this environment and was interrupted before completion.