fix(serverless): drop the concurrency flag the API no longer accepts

[danmrichards]

This change removes concurrency from the vendored serverless OpenAPI document
and regenerates the client. It also removes the --concurrency flag from apps
scale, the Concurrency row from the app display, the flag from the generated
command docs, and the field from the test fixtures.

The serverless API removes the field from its worker configuration, because no
worker applies it (RUNSERV-911). After that change, the API rejects a request
that contains concurrency with 422, so apps scale --concurrency would always
fail. Release this change before the API change deploys.

Co-Authored-By: Claude Opus 5.5 (1M context) noreply@anthropic.com

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[Copilot]

Copilot review overview

🟢 Approval recommended

The reviewed changes consistently remove the obsolete field and update related code, documentation, and fixtures.

Review effort: Lite
Findings: None

What changed in this PR

Removes the obsolete serverless concurrency field and CLI flag to match the updated API contract.

Changes:

• Removes concurrency from OpenAPI and generated client types.
• Removes the --concurrency flag and display row.
• Updates documentation, tests, and fixtures.

File	Description
internal/​cmd/​serverless/​display.go	Removes the concurrency display row.
internal/​cmd/​serverless/​display_test.go	Updates display expectations.
internal/​cmd/​serverless/​deploy_test.go	Updates app fixtures.
internal/​cmd/​serverless/​deploy_endpoints_test.go	Updates endpoint fixtures.
internal/​cmd/​serverless/​apps_scale.go	Removes concurrency flag handling.
internal/​cmd/​serverless/​apps_scale_test.go	Removes obsolete flag coverage.
internal/​api/​serverless/​gen/​client.gen.go	Regenerates worker configuration types.
internal/​api/​serverless/​client_test.go	Updates API response fixtures.
docs/​runware_serverless_apps_scale.md	Removes the obsolete documented flag.
api/​serverless/​openapi.yaml	Removes concurrency from API schemas.

Files not reviewed (1)

• internal/api/serverless/gen/client.gen.go: Generated file

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