Fix/#8994

[bujjibabukatta]

Summary

Closes #8994. Several component columns across the domain and tool layers were still varchar(N) instead of text, causing potential truncation and inconsistency with the rest of the codebase, where component has already been standardized to text for issue-tracking tables.

Changes

Struct type changes (Component field → text):

• core/models/domainlayer/code/pull_request.go
• core/models/domainlayer/ticket/incident.go
• core/models/domainlayer/codequality/cq_issues.go
• plugins/gitlab/models/mr.go
• plugins/bitbucket/models/pr.go
• plugins/bitbucket_server/models/pr.go
• plugins/gitee/models/pull_request.go
• plugins/github/models/pr.go
• plugins/sonarqube/models/sonarqube_hotspot.go (also drops the now-unnecessary index on component, since a text column can't be indexed the same way as varchar)

New migration scripts (8), one per affected table, each calling ModifyColumnType to alter the column at the DB level for existing installations:

• core/models/migrationscripts/20260722_change_pull_request_component_to_text.go
• core/models/migrationscripts/20260722_change_incident_component_to_text.go
• plugins/gitlab/models/migrationscripts/20260722_change_mr_component_to_text.go
• plugins/bitbucket/models/migrationscripts/20260722_change_pr_component_to_text.go
• plugins/bitbucket_server/models/migrationscripts/20260722_change_pr_component_to_text.go
• plugins/gitee/models/migrationscripts/20260722_change_pr_component_to_text.go
• plugins/github/models/migrationscripts/20260722_change_pr_component_to_text.go
• plugins/sonarqube/models/migrationscripts/20260722_change_hotspot_component_to_text.go (drops the component index before altering the column type)

Registered each new migration script in its corresponding register.go.

Testing

• go build ./... passes cleanly.
• Verified struct tags match the intended text type for all 9 affected models.
• Verified each migration script's target table name matches the model's TableName().

[bujjibabukatta]

@klesh can you please review and approve ?