Drop 'source' config key override.

Drop configuration key 'source' override in rabbitmq-server and
mysql-innodb-cluster applications.

Add bindep.txt to install package dependencies needed to run unit tests.

Related-Bug: #1991528
Change-Id: I345e3bb7be7492286daf9e5ab36506915f3daab9

bindep.txt

@@ -0,0 +1,4 @@
+libffi-dev [platform:dpkg]
+libpq-dev [platform:dpkg]
+libxml2-dev [platform:dpkg]
+libxslt1-dev [platform:dpkg]

tests/bundles/focal-yoga.yaml

@@ -33,8 +33,6 @@ applications:
   mysql-innodb-cluster:
     charm: ch:mysql-innodb-cluster
     num_units: 3
-    options:
-      source: *openstack-origin
     to:
       - '0'
       - '1'
@@ -52,7 +50,6 @@ applications:
       ssl: "off"
       management_plugin: "False"
       stats_cron_schedule: "*/1 * * * *"
-      source: *openstack-origin
     to:
       - '3'
       - '4'

tests/bundles/jammy-yoga.yaml

@@ -30,8 +30,6 @@ applications:
   mysql-innodb-cluster:
     charm: ch:mysql-innodb-cluster
     num_units: 3
-    options:
-      source: *openstack-origin
     to:
       - '0'
       - '1'
@@ -49,7 +47,6 @@ applications:
       ssl: "off"
       management_plugin: "False"
       stats_cron_schedule: "*/1 * * * *"
-      source: *openstack-origin
     to:
       - '3'
       - '4'