Deprecate core semantic attribute constants with exact conventions equivalents

[nicohrubec]

In getsentry/sentry-javascript, replace internal usages of the remaining public constants in packages/core/src/semanticAttributes.ts that have exact string equivalents in @sentry/conventions/attributes.

Add @deprecated notices pointing to the conventions alternatives, while preserving the existing public exports and their literal values for backwards compatibility. Update imports/usages across source and tests. This is a constant/import cleanup: emitted attribute keys, values, and behavior must remain unchanged.

The following 18 constants have verified 1:1 replacements in conventions 0.25.0:

Existing core constant	Conventions export	Identical attribute key
SEMANTIC_ATTRIBUTE_SENTRY_OP	SENTRY_OP	sentry.op
SEMANTIC_ATTRIBUTE_SENTRY_ORIGIN	SENTRY_ORIGIN	sentry.origin
SEMANTIC_ATTRIBUTE_SENTRY_STATUS_MESSAGE	SENTRY_STATUS_MESSAGE	sentry.status.message
SEMANTIC_ATTRIBUTE_SENTRY_IDLE_SPAN_FINISH_REASON	SENTRY_IDLE_SPAN_FINISH_REASON	sentry.idle_span_finish_reason
SEMANTIC_ATTRIBUTE_SENTRY_RELEASE	SENTRY_RELEASE	sentry.release
SEMANTIC_ATTRIBUTE_SENTRY_ENVIRONMENT	SENTRY_ENVIRONMENT	sentry.environment
SEMANTIC_ATTRIBUTE_SENTRY_SDK_INTEGRATIONS	SENTRY_SDK_INTEGRATIONS	sentry.sdk.integrations
SEMANTIC_ATTRIBUTE_USER_ID	USER_ID	user.id
SEMANTIC_ATTRIBUTE_USER_EMAIL	USER_EMAIL	user.email
SEMANTIC_ATTRIBUTE_USER_IP_ADDRESS	USER_IP_ADDRESS	user.ip_address
SEMANTIC_ATTRIBUTE_USER_USERNAME	USER_NAME	user.name
SEMANTIC_ATTRIBUTE_PROFILE_ID	SENTRY_PROFILE_ID	sentry.profile_id
SEMANTIC_ATTRIBUTE_EXCLUSIVE_TIME	SENTRY_EXCLUSIVE_TIME	sentry.exclusive_time
SEMANTIC_ATTRIBUTE_CACHE_HIT	CACHE_HIT	cache.hit
SEMANTIC_ATTRIBUTE_CACHE_KEY	CACHE_KEY	cache.key
SEMANTIC_ATTRIBUTE_CACHE_ITEM_SIZE	CACHE_ITEM_SIZE	cache.item_size
SEMANTIC_ATTRIBUTE_HTTP_REQUEST_METHOD	HTTP_REQUEST_METHOD	http.request.method
GEN_AI_CONVERSATION_ID_ATTRIBUTE	GEN_AI_CONVERSATION_ID	gen_ai.conversation.id

Keep the five already-deprecated core exports (segment name/ID, SDK name/version, and URL full) compatible. The link-type constant is already handled in #24958.

Leave constants without exact string equivalents unchanged: sentry.sample_rate, sentry.previous_trace_sample_rate, sentry.measurement_unit, sentry.measurement_value, and sentry.custom_span_name. In particular, SENTRY_CLIENT_SAMPLE_RATE resolves to sentry.client_sample_rate, so it is not a 1:1 replacement for sentry.sample_rate.

Verify that emitted attributes and public exports remain compatible, and check bundle size impact. Follow #22081 for the existing deprecation/import migration pattern.

[linear-code]

JS-3868