fix(includes): rewrite need_improvement.txt as MyST so plain `{include}` renders correctly

After the RST→MyST migration, ~45 MD pages use the plain `{include}` MyST
directive to pull in `_include/need_improvement.txt`. The included file
still contained RST (`.. raw:: html`, `.. raw:: latex`, `:ref:`), and
MyST's built-in `{include}` parses the content with the *outer* file's
parser — i.e. as MyST. RST directives then render as literal paragraphs.

Visible symptom on docs.vyos.io/en/rolling (and across 1.5/1.4):
the VPP index, VPP subpages, haproxy, isis, bfd, policy, pki, salt,
flowtables, webproxy, and others all show:

  .. raw:: latex
  \iffalse
  .. raw:: html
  Call for Contributions
  Help improve this section ...
  For contribution guidelines, see :ref: documentation .

Fix: rewrite `_include/need_improvement.txt` as a native MyST admonition
(`:::{admonition} Call for Contributions / :class: error / ... / :::`)
and drop the now-unnecessary `{eval-rst}` wrapper at the single callsite
(`configuration/highavailability/index.md`) that wrapped the include for
RST processing.

The fix is companion to 9c815d68 (cmdincludemd RST plumbing) but targets
the plain-`{include}` path which doesn't route through our custom
extension.

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