chore(PLT-3524): remove SonarCloud from shared frontend workflows

[jhuliano]

Jira link: https://typeform.atlassian.net/browse/PLT-3524

SonarCloud has been decommissioned. This PR removes the SonarCloud analysis job/step from the shared frontend workflows and neuters the standalone sonarcloud-scan.yml. The run-sonarcloud / sonarcloud-timeout / sonarcloud-wait-for-tests / sonar-project-key inputs and the SONAR_CLOUD_TOKEN secret are kept as no-op deprecated for backward compatibility with existing callers.

Affected workflows:

• frontend-pr-workflow.yml — sonar job removed.
• frontend-deploy-workflow.yml — sonar job removed; dropped stale fetch-depth: 0 (only needed for sonar) on the unit-tests checkout.
• frontend-library-pr-release-workflow.yml — inline sonar step removed.
• sonarcloud-scan.yml — reduced to a passing no-op that logs a deprecation warning.

[gitstream-cm]

🥷 Code experts: kb-typeform, bobobowis

kb-typeform, bobobowis have most 👩‍💻 activity in the files.
kb-typeform has most 🧠 knowledge in the files.

See details

.github/workflows/frontend-deploy-workflow.yml

Activity based on git-commit:

	kb-typeform	bobobowis
JUL		18 additions & 2 deletions
JUN
MAY
APR	4 additions & 0 deletions	48 additions & 3 deletions
MAR	59 additions & 31 deletions
FEB	374 additions & 9 deletions

Knowledge based on git-blame:
kb-typeform: 83%

.github/workflows/frontend-library-pr-release-workflow.yml

Activity based on git-commit:

	kb-typeform	bobobowis
JUL		11 additions & 1 deletions
JUN
MAY
APR
MAR	0 additions & 22 deletions
FEB	23 additions & 1 deletions

Knowledge based on git-blame:
kb-typeform: 89%

.github/workflows/frontend-pr-workflow.yml

Activity based on git-commit:

	kb-typeform	bobobowis
JUL		18 additions & 2 deletions
JUN
MAY
APR	5 additions & 2 deletions
MAR	65 additions & 28 deletions
FEB	273 additions & 92 deletions

Knowledge based on git-blame:
kb-typeform: 86%

.github/workflows/sonarcloud-scan.yml

Activity based on git-commit:

	kb-typeform	bobobowis
JUL		5 additions & 0 deletions
JUN
MAY
APR
MAR	10 additions & 0 deletions
FEB

Knowledge based on git-blame:
kb-typeform: 90%

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