Introduce access-review source snapshot and normalize naming

Decouple each campaign from the live access-review sources it was started
with by introducing a per-campaign source snapshot table
(access_review_campaign_sources). The snapshot captures the source name,
category, and connector at start time, so a review remains coherent even
after the underlying source is edited or deleted. Fetch tracking becomes
an append-only log (access_review_campaign_source_fetch_attempts) that
preserves every attempt with its own status and error rather than
overwriting a single row.

Rename the shared access-review tables and enums to use a consistent
access_review_ prefix throughout:

  access_entries          → access_review_entries
  access_sources          → access_review_sources
  access_source_category  → access_review_source_category
  access_entry_*          → access_review_entry_*

The same rename propagates to every coredata type, service, GraphQL
schema, MCP specification, CLI command, frontend component, and e2e test.
The accessreview package gains dedicated actions.go and policies.go files
for its own IAM policy set, mirroring the agentrun package pattern.

Signed-off-by: Bryan Frimin <bryan@probo.com>

pkg/coredata/connector_settings.go

@@ -109,7 +109,7 @@ type (
 
 	// DatadogConnectorSettings holds the per-customer Datadog site captured
 	// during the OAuth callback. Region is the site key (e.g. "US3") used for
-	// the AccessSource title; Domain is the API domain (e.g.
+	// the AccessReviewSource title; Domain is the API domain (e.g.
 	// "us3.datadoghq.com") the driver and name resolver use to build hosts.
 	DatadogConnectorSettings struct {
 		Region string `json:"region"`
@@ -132,7 +132,7 @@ type (
 	// redirect, and it rides the signed state token to the callback —
 	// Zendesk does not echo it back). Subdomain is the <subdomain> part of
 	// <subdomain>.zendesk.com, used by the driver to build the API host and
-	// by the name resolver for the AccessSource title.
+	// by the name resolver for the AccessReviewSource title.
 	ZendeskConnectorSettings struct {
 		Subdomain string `json:"subdomain"`
 	}