Fixes the bitbucket API failures (#993)

Bitbucket now has three types of access tokens, repository access token,
project access token and workspace access token:
https://developer.atlassian.com/cloud/bitbucket/rest/intro/#access-tokens.

The config-sync-ci-bot account only has access to the repository access
token. The other two requires upgrading to premium plan.

The repository access token only allows listing repositories with the
project filter. Hence this commit as a query to the list call.

b/308221985
b/308219656

e2e/nomostest/gitproviders/bitbucket.go

@@ -212,8 +212,8 @@ func FetchCloudSecret(name string) (string, error) {
 func (b *BitbucketClient) deleteObsoleteReposByPage(accessToken string, page int) (int, error) {
 	out, err := exec.Command("curl", "-sX", "GET",
 		"-H", fmt.Sprintf("Authorization:Bearer %s", accessToken),
-		fmt.Sprintf("https://api.bitbucket.org/2.0/repositories/%s?page=%d",
-			GitUser, page)).CombinedOutput()
+		fmt.Sprintf(`https://api.bitbucket.org/2.0/repositories/%s?q=project.key="%s"&page=%d`,
+			GitUser, bitbucketProject, page)).CombinedOutput()
 	if err != nil {
 		return -1, errors.Wrap(err, string(out))
 	}