Bump BCApps repo and app manifests to 26.15

[Copilot]

Align the repository release version with the 26.15 train by updating AL-Go settings and every app manifest in the repo. This keeps package metadata consistent across System Application, Business Foundation, and tooling apps.

• AL-Go repo version

  • Updated .github/AL-Go-Settings.json to set repoVersion to 26.15.

• App manifest versions

  • Updated the top-level version field in all app.json files to 26.15.0.0.
  • This applies across app, test, and test-library manifests so all shipped artifacts advertise the same release version.

• Representative manifest change

  {
    "repoVersion": "26.15",
    "version": "26.15.0.0"
  }

  Fixes AB#636795

[mirouhl]

@copilot check if there is version 26.14.0.0 left in app files and fix

[Copilot]

@copilot check if there is version 26.14.0.0 left in app files and fix

Addressed in 5319da9. I updated the remaining 26.14.0.0 references in app.json files to 26.15.0.0 and verified there are no 26.14.0.0 values left in any app.json file.