Temporarily remove pending release notes

This is needed in preparation of the 3.19.1 release.

Change-Id: I0754820ef98b83d9d0d0c9972b408a40a6c86dcd

releasenotes/notes/non-final-builds-d9024df868c7e036.yaml

@@ -1,9 +0,0 @@
----
-features:
-  - |
-    The builds/ and buildset/ API endpoints now include information about
-    retried builds. They are called non-final as those are all builds that
-    were retried at least once and thus weren't visible to the user so far.
-
-    The builds/ API can filter those retried builds and you might exclude
-    them from API result by setting ``final=false`` in the API request.

releasenotes/notes/report-build-page-49088c2b0a36e1b5.yaml

@@ -1,17 +0,0 @@
----
-features:
-  - |
-    An option to use the URL of the Zuul build page when reporting has
-    been added.  This fetaure requires that all the pipelines in the
-    tenant have a :ref:`SQL reporter<sql_reporter>` configured, and at
-    least one of :attr:`tenant.web-root` or :attr:`web.root` must be
-    defined.
-
-    See :attr:`tenant.report-build-page`.
-upgrade:
-  - |
-    As further integration with the web interface is planned, the
-    :attr:`web.root` setting in ``zuul.conf`` is marked required and
-    future releases may error if it is missing.  Please add it to your
-    configuration now.  See :attr:`tenant.web-root` for additional
-    information about whitelabel tenants.

releasenotes/notes/skip-host-keys-61418c8be322a823.yaml

@@ -1,6 +0,0 @@
----
-features:
-  - |
-    Host key checking is now disabled for a host in the generated
-    Ansible inventory if ``host-key-checking`` is set to ``False``
-    in the corresponding nodepool config.