feat: add prometheus.getSilence ,prometheus.query and prometheus.queryRange action components

[samuel-asleep]

Adds three new action components to the Prometheus integration: getSilence, query, and queryRange.

Backend (pkg/integrations/prometheus/)

• client.go: Extended AlertmanagerSilence with full Alertmanager v2 fields (Matchers, StartsAt, EndsAt, CreatedBy, Comment, UpdatedAt); added GetSilence(silenceID string) (GET /api/v2/silence/{id}) and QueryRange(query, start, end, step string) (GET /api/v1/query_range) methods
• get_silence.go: Fetches a silence by ID, emits prometheus.silence payload, stores GetSilenceNodeMetadata{SilenceID}
• query.go: Executes instant PromQL query, emits prometheus.query payload, stores QueryNodeMetadata{Query}
• query_range.go: Executes range PromQL query (requires query, start, end, step), emits prometheus.queryRange payload, stores QueryRangeNodeMetadata{Query}
• prometheus.go: Registered all three components in Components()
• example.go: Embedded example output JSON for all three; added ExampleOutput() methods

Frontend (web_src/src/pages/workflowv2/mappers/prometheus/)

• get_silence.ts: Canvas metadata shows silence ID (bell-off); execution details show status, matchers, start/end, creator, comment
• query.ts / query_range.ts: Canvas metadata shows PromQL expression (search); execution details show query params, result type, and result count
• types.ts: Added typed interfaces for all three components' configuration, node metadata, and payload
• index.ts: Registered new mappers and event state entries (retrieved / queried)

closes #3083

video

2026-02-23.16-22-20.mp4

[samuel-asleep]

@AleksandarCole @forestileao the final part of the components

[samuel-asleep]

@forestileao Refactored GetSilence.Execute() to remove manual map[string]any building (including the custom matchers loop) and replaced it with a typed getSilencePayload + mapstructure.Decode, consistent with our existing decoding pattern.

• Added mapstructure tags to Matcher in client.go to preserve camelCase keys.
• Introduced getSilencePayload in get_silence.go and decode it into map[string]any with proper error handling.

[forestileao]

@samuel-asleep I applied some minor fixes:

• Show begin and End ranges on component ui
• Updated Silence property to be ResourceList like ExpireSilence

[forestileao]

[forestileao]

@samuel-asleep Thanks for the contribution. Feel free to claim your bounty.

cc: @AleksandarCole