fixes #6427 / BZ 1109737 - remove Nest option from taxonomy actions

This commit removes Nest as a valid option for taxonomies (e.g Organization
& Location)
fixes #6434 - wrap long lifecycle environment names in CV promotion
fixes #6439 / BZ 1094190 - Include notification on add/remove pkg filter rule

When the user adds/removes a rule from a package filter (associated
with a content view), display a notification consistent with what
is done for package groups.
fixes #6428 / BZ 1109062 - Bulk Host Collection - disable add/remove when no hosts selected

When the user is performing a content host bulk action, if they do
not select any content hosts, disable the add/remove buttons
for host collections.
Fixes #5628 - remove converted v1 API controllers and tests.

Remove all of the v1 controllers and tests that have already been
converted to v2 and are no longer used.
refs #3272 - fixing db/seeds.rb for katello, BZ 868910
Merge pull request #4368 from komidore64/rmi3272

refs #3272 - fixing db/seeds.rb for katello, BZ 868910
Merge pull request #4303 from waldenraines/5628

Fixes #5628 - remove converted v1 API controllers and tests.
fixes #6433 - allow a lifecycle environment to be unselected

When promoting a content view version, it's now possible to uncheck the
lifecycle environment checkbox.
Merge pull request #4365 from stbenjam/bz1111080-uncheck-env

fixes #6433 - allow a lifecycle environment to be unselected
Merge pull request #4362 from bbuckingham/issue-6427

fixes #6427 / BZ 1109737 - remove Nest option from taxonomy actions
Merge pull request #4363 from bbuckingham/issue-6428

fixes #6248 / BZ 1109062 - Bulk Host Collection - disable add/remove when no hosts selected
Merge pull request #4367 from bbuckingham/issue-6439

fixes #6439 / BZ 1094190 - Include notification on add/remove pkg filter rule
Merge pull request #4366 from stbenjam/6434-long-env-name

fixes #6434 - wrap long lifecycle environment names in the UI