chore!: Introduce ZITADEL v3 (#9645)

This PR summarizes multiple changes specifically only available with
ZITADEL v3:

- feat: Web Keys management
(https://github.com/zitadel/zitadel/pull/9526)
- fix(cmd): ensure proper working of mirror
(https://github.com/zitadel/zitadel/pull/9509)
- feat(Authz): system user support for permission check v2
(https://github.com/zitadel/zitadel/pull/9640)
- chore(license): change from Apache to AGPL
(https://github.com/zitadel/zitadel/pull/9597)
- feat(console): list v2 sessions
(https://github.com/zitadel/zitadel/pull/9539)
- fix(console): add loginV2 feature flag
(https://github.com/zitadel/zitadel/pull/9682)
- fix(feature flags): allow reading "own" flags
(https://github.com/zitadel/zitadel/pull/9649)
- feat(console): add Actions V2 UI
(https://github.com/zitadel/zitadel/pull/9591)

BREAKING CHANGE
- feat(webkey): migrate to v2beta API
(https://github.com/zitadel/zitadel/pull/9445)
- chore!: remove CockroachDB Support
(https://github.com/zitadel/zitadel/pull/9444)
- feat(actions): migrate to v2beta API
(https://github.com/zitadel/zitadel/pull/9489)

---------

Co-authored-by: Livio Spring <livio.a@gmail.com>
Co-authored-by: Stefan Benz <46600784+stebenz@users.noreply.github.com>
Co-authored-by: Silvan <27845747+adlerhurst@users.noreply.github.com>
Co-authored-by: Ramon <mail@conblem.me>
Co-authored-by: Elio Bischof <elio@zitadel.com>
Co-authored-by: Kenta Yamaguchi <56732734+KEY60228@users.noreply.github.com>
Co-authored-by: Harsha Reddy <harsha.reddy@klaviyo.com>
Co-authored-by: Livio Spring <livio@zitadel.com>
Co-authored-by: Max Peintner <max@caos.ch>
Co-authored-by: Iraq <66622793+kkrime@users.noreply.github.com>
Co-authored-by: Florian Forster <florian@zitadel.com>
Co-authored-by: Tim Möhlmann <tim+github@zitadel.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Max Peintner <peintnerm@gmail.com>

go.mod

@@ -24,6 +24,7 @@ require (
 	github.com/drone/envsubst v1.0.3
 	github.com/envoyproxy/protoc-gen-validate v1.2.1
 	github.com/fatih/color v1.18.0
+	github.com/fergusstrange/embedded-postgres v1.30.0
 	github.com/gabriel-vasile/mimetype v1.4.8
 	github.com/go-chi/chi/v5 v5.2.1
 	github.com/go-jose/go-jose/v4 v4.0.5
@@ -146,6 +147,7 @@ require (
 	github.com/tidwall/match v1.1.1 // indirect
 	github.com/tidwall/pretty v1.2.1 // indirect
 	github.com/tidwall/sjson v1.2.5 // indirect
+	github.com/xi2/xz v0.0.0-20171230120015-48954b6210f8 // indirect
 	github.com/yuin/gopher-lua v1.1.1 // indirect
 	github.com/zenazn/goji v1.0.1 // indirect
 	go.opentelemetry.io/auto/sdk v1.1.0 // indirect
@@ -187,7 +189,6 @@ require (
 	github.com/go-errors/errors v1.5.1 // indirect
 	github.com/go-sourcemap/sourcemap v2.1.4+incompatible // indirect
 	github.com/go-xmlfmt/xmlfmt v1.1.3 // indirect
-	github.com/gofrs/flock v0.12.1 // indirect
 	github.com/golang/geo v0.0.0-20250319145452-ed1c8b99c3d7 // indirect
 	github.com/google/uuid v1.6.0
 	github.com/googleapis/enterprise-certificate-proxy v0.3.6 // indirect