[registry] Make Artifact Hub rate limit configurable

[KumarNirupam1]

Description

Relates to meshery/meshery #11034

Fixes the meshkit side of meshery#11034 — rate-limited model generation during mesheryctl registry generate.

Issue

The daily model generator CI runs registry generate over many Artifact Hub models. When too many requests hit artifacthub.io at once, the API returns HTTP 429 and those models fail:

status code 429 for https://artifacthub.io/api/v1/packages/search?...

meshkit already had basic rate limiting in RateLimitArtifactHub() — sleep 5 minutes after every 100 Artifact Hub model starts — but both values were hardcoded globals. mesheryctl and the CI workflow had no way to configure a longer wait or a lower request limit when 429s show up.

Solution (this PR)

Make the existing rate limit configurable through GenerationOptions, without changing default behavior.

registry/helpers.go

• ArtifactHubRequestLimit — sleep after this many Artifact Hub model starts (default: 100)
• ArtifactHubWaitDuration — how long to sleep when the limit is hit (default: 5m)
• Defaults set in DefaultGenerationOptions()

registry/model.go

• RateLimitArtifactHub(requestLimit, waitDuration) uses the passed values (falls back to 100 / 5m if zero)
• InvokeGenerationFromSheetWithOptions passes opts.ArtifactHubRequestLimit and opts.ArtifactHubWaitDuration

If no options are set, behavior is identical to before. Callers (mesheryctl, once wired) can tune values for CI, e.g. limit 20 and wait 10m to sleep sooner and reduce 429s.

Out of scope (follow-up)

• meshery: mesheryctl flags and model-generator.yml workflow inputs — needed to close meshery#11034 fully
• meshkit: HTTP 429 retry in generators/artifacthub/scanner.go — separate improvement (#11161)
• meshkit: changing parallel worker count (semaphore.NewWeighted(20))

Notes for Reviewers

• 2 files changed; same mutex + counter logic, only parameterized
• meshery PR to follow after meshkit release: bump meshkit + expose CLI/workflow knobs

Signed commits

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[gemini-code-assist]

Code Review

This pull request makes the Artifact Hub rate limiting parameters configurable by adding ArtifactHubRequestLimit and ArtifactHubWaitDuration to GenerationOptions and updating RateLimitArtifactHub to accept these parameters. The review feedback highlights a concurrency issue where holding the artifactHubMutex lock during time.Sleep blocks other goroutines, and suggests adding a TODO comment to address this in a follow-up task.

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[yi-nuo426]

I'm placing this PR on-hold.