Adjust generate-yamls.sh due to pkg/embeddedyamls/yamls.go removal

...from submariner-operator in lieu of using Go embed functionality.
The charts project needs to obtain the RBAC and CRD yaml files from the
submariner, submariner-operator and mcs-api projects. To achieve this,
define a simple Go file that statically references the packages
containing the desired embed.go and yaml files. The generate-yamls.sh
script uses 'go mod' commands to create the go.mod file and vendor
directory, which also downloads the yaml files.

Signed-off-by: Tom Pantelis <tompantelis@gmail.com>

.gitignore

@@ -6,7 +6,9 @@ Makefile.dapper
 Makefile.shipyard
 Dockerfile.*
 helm_repo
-yamls
+yamls/go.mod
+yamls/go.sum
+yamls/vendor
 submariner-k8s-broker/crds/crd.yaml
 submariner-k8s-broker/templates/_role.tpl
 submariner-operator/crds/crd.yaml