[Fleet] Remove No Tags from add/remove popover (#218673)

Closes #218636 

## Summary

- Removes the `No Tags` option from the add/remove popover as it is not
actually a tag, but only to be used in the filter dropdown.


### Checklist

Check the PR satisfies following conditions. 

Reviewers should verify this PR satisfies this list as well.

- [ ] Any text added follows [EUI's writing
guidelines](https://elastic.github.io/eui/#/guidelines/writing), uses
sentence case text and includes [i18n
support](https://github.com/elastic/kibana/blob/main/src/platform/packages/shared/kbn-i18n/README.md)
- [ ]
[Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html)
was added for features that require explanation or tutorials
- [ ] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios
- [ ] If a plugin configuration key changed, check if it needs to be
allowlisted in the cloud and added to the [docker
list](https://github.com/elastic/kibana/blob/main/src/dev/build/tasks/os_packages/docker_generator/resources/base/bin/kibana-docker)
- [ ] This was checked for breaking HTTP API changes, and any breaking
changes have been approved by the breaking-change committee. The
`release_note:breaking` label should be applied in these situations.
- [ ] [Flaky Test
Runner](https://ci-stats.kibana.dev/trigger_flaky_test_runner/1) was
used on any tests changed
- [ ] The PR description includes the appropriate Release Notes section,
and the correct `release_note:*` label is applied per the
[guidelines](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)

### Identify risks

N/A

---------

Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>

x-pack/platform/plugins/shared/fleet/public/applications/fleet/sections/agents/agent_list_page/components/search_and_filter_bar.tsx

@@ -15,6 +15,7 @@ import {
   EuiToolTip,
 } from '@elastic/eui';
 import { FormattedMessage } from '@kbn/i18n-react';
+import { i18n } from '@kbn/i18n';
 
 import { useIsFirstTimeAgentUserQuery } from '../../../../../integrations/sections/epm/screens/detail/hooks';
 
@@ -99,7 +100,10 @@ export const SearchAndFilterBar: React.FunctionComponent<SearchAndFilterBarProps
   const { isFirstTimeAgentUser, isLoading: isFirstTimeAgentUserLoading } =
     useIsFirstTimeAgentUserQuery();
   const { cloud } = useStartServices();
-
+  const NO_TAGS_VALUE = i18n.translate('xpack.fleet.agentList.noTagsValue', {
+    defaultMessage: 'No Tags',
+  });
+  const tagsWithNoTagsIncluded = [...tags, NO_TAGS_VALUE];
   return (
     <>
       <EuiFlexGroup direction="column">
@@ -187,7 +191,7 @@ export const SearchAndFilterBar: React.FunctionComponent<SearchAndFilterBarProps
                   disabled={agentPolicies.length === 0}
                 />
                 <TagsFilter
-                  tags={tags}
+                  tags={tagsWithNoTagsIncluded}
                   selectedTags={selectedTags}
                   onSelectedTagsChange={onSelectedTagsChange}
                 />

x-pack/platform/plugins/shared/fleet/public/applications/fleet/sections/agents/agent_list_page/hooks/use_fetch_agents_data.tsx

@@ -32,9 +32,6 @@ import { getKuery } from '../utils/get_kuery';
 
 const REFRESH_INTERVAL_MS = 30000;
 const MAX_AGENT_ACTIONS = 100;
-const NO_TAGS_VALUE = i18n.translate('xpack.fleet.noTagsValue', {
-  defaultMessage: 'No Tags',
-});
 /** Allow to fetch full agent policy using a cache */
 function useFullAgentPolicyFetcher() {
   const authz = useAuthz();
@@ -289,7 +286,7 @@ export function useFetchAgentsData() {
 
           setAgentsStatus(agentStatusesToSummary(statusSummary));
 
-          const newAllTags = [...agentTagsResponse.data.items, NO_TAGS_VALUE];
+          const newAllTags = [...agentTagsResponse.data.items];
           // We only want to update the list of available tags if
           // - We haven't set any tags yet
           // - We've received the "refreshTags" flag which will force a refresh of the tags list when an agent is unenrolled