Gitea: Recover soft-deleted secret

[tanya-borisova]

PR for issue #1760

What is being addressed

Due to:

• purge protection being enabled on keyvault in some environment (e.g. main E2E tests in CI), and
• Terraform purging secrets while deleting them (enabled by default),
  E2E tests are failing on main because secrets can't be purged.

This PR changes settings for azurerm Terraform provider, so that it does no longer purge secrets while deleting them, and restores soft-deleted secrets.
So secrets will be merely soft-deleted but never purged, consecutive runs of E2E tests will be restoring and using previously deleted secrets.

This was tested in a dev environment with enabled purge protection via running E2E several consecutive times.

[github-actions]

Unit Test Results

0 files   - 1  0 suites   - 1   0s ⏱️ - 4m 13s
0 tests  - 4  0 ✔️  - 1  0 💤 ±0  0 ❌  - 3 

Results for commit cb1ec0a. ± Comparison against base commit 3d96600.

This pull request removes 4 tests.

test_shared_services ‑ test_create_shared_service[tre-shared-service-gitea]
test_shared_services ‑ test_create_shared_service[tre-shared-service-nexus]
test_shared_services ‑ test_patch_firewall
test_workspace_services ‑ test_create_guacamole_service_into_base_workspace

♻️ This comment has been updated with latest results.

[tanya-borisova]

/test

[github-actions]

🤖 pr-bot 🤖

🏃 Running tests: https://github.com/microsoft/AzureTRE/actions/runs/2271096199 (with refid 25ece6b6)

(in response to this comment from @tanya-borisova)

[tanya-borisova]

/test

[github-actions]

🤖 pr-bot 🤖

🏃 Running tests: https://github.com/microsoft/AzureTRE/actions/runs/2274413299 (with refid 25ece6b6)

(in response to this comment from @tanya-borisova)

[tanya-borisova]

/test

[github-actions]

🤖 pr-bot 🤖

🏃 Running tests: https://github.com/microsoft/AzureTRE/actions/runs/2274422721 (with refid 25ece6b6)

(in response to this comment from @tanya-borisova)