The Go module proxy requires tags in the format v2/vX.Y.Z for modules
in a v2/ subdirectory. Adds v2/.releaserc.json with the correct
tagFormat and a CI release job to run semantic-release for the v2
module independently of the root module.

PgBouncer in transaction-pooling mode does not support server-side
prepared statements, which is pgx's default (QueryExecModeCacheStatement).
This causes 'prepared statement already exists' errors in production.

Default to QueryExecModeSimpleProtocol, matching the Container Registry's
approach and GitLab.com's deployment topology. Expose QueryExecMode as a
Config field so consumers connecting directly to PostgreSQL can opt into
cached statements when desired.

pgxpool.NewWithConfig panics when given a Config not created by
ParseConfig (it checks an internal createdByParseConfig flag).
Store the DSN and re-parse it in Start() via pgxpool.ParseConfig,
then overlay the connection-level settings (query exec mode, tracer)
from the eagerly-parsed ConnConfig.

- Pin node image to 22 instead of floating lts tag
- Pass --yes to npx to prevent CI hangs
- Set GIT_DEPTH: 0 so semantic-release has full history and tags
- Add comment clarifying no tag format collision with root module

chore(deps): update pre-commit hook gitlab-com/gl-infra/common-ci-tasks to v3.9

See merge request !366



Merged-by: Elliot Forbes <eforbes@gitlab.com>
Approved-by: Elliot Forbes <eforbes@gitlab.com>
Co-authored-by: GitLab Renovate Bot <ops-contact+gl-common-ci-tasks-self-renovate@gitlab.com>

feat(v2/postgres): add QueryExecMode config with SimpleProtocol default for PgBouncer

See merge request !363



Merged-by: Elliot Forbes <eforbes@gitlab.com>
Approved-by: Elliot Forbes <eforbes@gitlab.com>
Reviewed-by: GitLab Duo <gitlab-duo@gitlab.com>
Co-authored-by: dbarrett <dbarrett@gitlab.com>

ci(v2): add release configuration for v2 module

See merge request !359



Merged-by: Elliot Forbes <eforbes@gitlab.com>
Approved-by: Elliot Forbes <eforbes@gitlab.com>
Reviewed-by: GitLab Duo <gitlab-duo@gitlab.com>
Co-authored-by: dbarrett <dbarrett@gitlab.com>