chore: sync OpenAPI spec with latest production spec (#667)

* chore: sync OpenAPI spec with latest production spec

Downloads latest spec from https://app.launchdarkly.com/api/v2/openapi.json
and regenerates cmd/resources/resource_cmds.go.

New operations added (6):
- POST /api/v2/projects/{projectKey}/ai-configs/prompt-snippets (postPromptSnippet)
- GET /api/v2/projects/{projectKey}/experiments (getExperimentsAnyEnv)
- POST /api/v2/auditlog/counts (postAuditLogEntryCounts)
- GET /api/v2/usage/observability/metrics (getObservabilityMetricsUsage)
- GET /api/v2/usage/sdk-versions/details (getSdkVersionsDetails)
- GET /api/v2/usage/vega-ai (getVegaAIUsage)

Total operations: 345 -> 351

Co-Authored-By: Ari Salem <asalem@launchdarkly.com>

* fix: add trailing newline to ld-openapi.json for pre-commit hook

Co-Authored-By: Ari Salem <asalem@launchdarkly.com>

---------

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: Ari Salem <asalem@launchdarkly.com>

Author: devin-ai-integration[bot]