feat: Add rebrand CI/CD workflows to main branch

- Add 72 rebrand workflow files (polkadot→pezkuwi, substrate→bizinikiwi, cumulus→pezcumulus)
- Add GitHub actions, issue templates, and configs
- Removed unnecessary workflows (fork-sync, gitspiegel, upstream-tracker, sync-templates, backport)
- Renamed zombienet test files to match new naming convention

.github/scripts/release/distributions

@@ -0,0 +1,39 @@
+Origin: Parity
+Label: Parity
+Codename: release
+Architectures: amd64
+Components: main
+Description: Apt repository for software made by Parity Technologies Ltd.
+SignWith: 90BD75EBBB8E95CB3DA6078F94A4029AB4B35DAE
+
+Origin: Parity
+Label: Parity Staging
+Codename: staging
+Architectures: amd64
+Components: main
+Description: Staging distribution for Parity Technologies Ltd. packages
+SignWith: 90BD75EBBB8E95CB3DA6078F94A4029AB4B35DAE
+
+Origin: Parity
+Label: Parity stable2407
+Codename: stable2407
+Architectures: amd64
+Components: main
+Description: Apt repository for software made by Parity Technologies Ltd.
+SignWith: 90BD75EBBB8E95CB3DA6078F94A4029AB4B35DAE
+
+Origin: Parity
+Label: Parity stable2409
+Codename: stable2409
+Architectures: amd64
+Components: main
+Description: Apt repository for software made by Parity Technologies Ltd.
+SignWith: 90BD75EBBB8E95CB3DA6078F94A4029AB4B35DAE
+
+Origin: Parity
+Label: Parity stable2412
+Codename: stable2412
+Architectures: amd64
+Components: main
+Description: Apt repository for software made by Parity Technologies Ltd.
+SignWith: 90BD75EBBB8E95CB3DA6078F94A4029AB4B35DAE