[Security] Updates docs for enabling Defend access on macOS (#2396)

Resolves #2101 by adding
instructions for approving the `ElasticEndpoint` system extension for
macOS Sequoia.

Instead of creating a new page for macOS Sequoia, I consolidated the
existing instructions for Monterey and Ventura with the new instructions
for Sequoia into a single page using tabs, since the differences are
minimal.

For the removed pages ([Enable access for macOS
Monterey](https://www.elastic.co/docs/solutions/security/configure-elastic-defend/enable-access-for-macos-monterey)
and [Enable access for macOS Ventura and
higher](https://www.elastic.co/docs/solutions/security/configure-elastic-defend/enable-access-for-macos-ventura-higher)),
I've changed them to "hidden" in the TOC, replaced the content with a
"This page has moved" note, and created redirects in the redirect.yml
file.

Previews:
* [Enable access on
macOS](https://docs-v3-preview.elastic.dev/elastic/docs-content/pull/2396/solutions/security/configure-elastic-defend/enable-access-for-macos)
* [Elastic Defend
requirements](https://docs-v3-preview.elastic.dev/elastic/docs-content/pull/2396/solutions/security/configure-elastic-defend/elastic-defend-requirements)

Removed pages: 
* [Enable access for macOS
Monterey](https://docs-v3-preview.elastic.dev/elastic/docs-content/pull/2396/solutions/security/configure-elastic-defend/enable-access-for-macos-monterey)
* [Enable access for macOS Ventura and
higher](https://docs-v3-preview.elastic.dev/elastic/docs-content/pull/2396/solutions/security/configure-elastic-defend/enable-access-for-macos-ventura-higher)

Author: natasha-moore-elastic

redirects.yml

@@ -299,4 +299,8 @@ redirects:
 # Related to
   'solutions/observability/apm/get-started-serverless.md': 'solutions/observability/apm/get-started.md'
   'solutions/observability/apm/get-started-fleet-managed-apm-server.md': 'reference/fleet/get-started-managed-apm-server.md'
-  'solutions/observability/apm/get-started-apm-server-binary.md': 'reference/fleet/get-started-apm-server-binary.md'
+  'solutions/observability/apm/get-started-apm-server-binary.md': 'reference/fleet/get-started-apm-server-binary.md'
+
+# Related to https://github.com/elastic/docs-content/pull/2396
+  'solutions/security/configure-elastic-defend/enable-access-for-macos-monterey.md': 'solutions/security/configure-elastic-defend/enable-access-for-macos.md'
+  'solutions/security/configure-elastic-defend/enable-access-for-macos-ventura-higher.md': 'solutions/security/configure-elastic-defend/enable-access-for-macos.md'