Integrate gitlab-ci/hide-stages-if-variables-not-set and 4 more

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@64dc51d3

Use regex operator to check for multiple variables

The "&&" operator does not work as expected when checking if multiple
variables are set.

See for reference:
https://gitlab.com/gitlab-org/gitlab/-/issues/321371

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@89fbce24

Hide Confluence stage if confluence variables not set

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@db50e93b

Hide deploy stage if DEPLOY_RELEASE_TARGET not set

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@f4aa0048

Hide FTP stage if DEPLOY_FTP_TARGET not set

This makes the variable HIDE_FTP_UPLOAD_STAGE obsolete, because we can
hide the FTP stage now by setting DEPLOY_FTP_TARGET to an empty string.

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@409c4f27

Do not run CI test sub-pipeline on master

.gitlab-ci @ 64dc51d3

-Subproject commit a731b1569292fc3742fa16fc2328524ea2a93f9f
+Subproject commit 64dc51d3244909d5ce3dd1a99580d60fce0f0a64

.gitlab-ci.yml

@@ -4,8 +4,8 @@
 # ---------------------------------------------------------------------------------------
 include:
   - project: '${CI_PROJECT_ROOT_NAMESPACE}/yocto/infrastructure/gitlab-ci'
-    ref: a731b1569292fc3742fa16fc2328524ea2a93f9f
+    ref: 64dc51d3244909d5ce3dd1a99580d60fce0f0a64
     file: 'manifest-integration.yml'
 
 variables:
-  GITLAB_CI_REVISION: a731b1569292fc3742fa16fc2328524ea2a93f9f
+  GITLAB_CI_REVISION: 64dc51d3244909d5ce3dd1a99580d60fce0f0a64