bug#64274: 30.0.50; Eglot requests textDocument/documentSymbol if its not declared in the server capabilities

[Wilhelm Kirschbaum]

Calling imenu when eglot is enabled it will request
textDocument/documentSymbol even if the server has not declared it 
as a
capability.  I believe this issue is with `eglot-imenu'.

The client will recover if the server replies with an error, but 
outputs
an ugly error.

In GNU Emacs 30.0.50 (build 11, x86_64-pc-linux-gnu, GTK+ Version
3.24.38, cairo version 1.17.8) of 2023-06-24 built on 
melissa.local
Repository revision: a3df33f1c2f8beb08ea9fc4b91eaeae78db79489
Repository branch: master
System Description: Arch Linux

Configured using:
'configure --with-pgtk --with-tree-sitter --with-json
--with-native-compilation=aot'
Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ 
JPEG
JSON LCMS2 LIBSYSTEMD LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY 
PDUMPER
PGTK PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF 
TOOLKIT_SCROLL_BARS
TREE_SITTER WEBP XIM GTK3 ZLIB
Important settings:
 value of $LANG: en_ZA.UTF-8
 locale-coding-system: utf-8-unix

Major mode: mu4e:main

Minor modes in effect:
 mu4e-search-minor-mode: t
 mu4e-update-minor-mode: t
 mu4e-context-minor-mode: t
 global-floatpays-mode: t
 marginalia-mode: t
 savehist-mode: t
 vertico-mode: t
 global-corfu-mode: t
 electric-pair-mode: t
 yas-global-mode: t
 global-flycheck-mode: t
 global-treesit-auto-mode: t
 global-diff-hl-mode: t
 global-git-commit-mode: t
 shell-dirtrack-mode: t
 server-mode: t
 global-jinx-mode: t
 which-key-mode: t
 override-global-mode: t
 pixel-scroll-precision-mode: t
 repeat-mode: t
 winner-mode: t
 save-place-mode: t
 which-function-mode: t
 global-auto-revert-mode: t
 tooltip-mode: t
 global-eldoc-mode: t
 show-paren-mode: t
 electric-indent-mode: t
 mouse-wheel-mode: t
 tab-bar-mode: t
 file-name-shadow-mode: t
 global-font-lock-mode: t
 blink-cursor-mode: t
 buffer-read-only: t
 column-number-mode: t
 line-number-mode: t
 transient-mark-mode: t
 auto-composition-mode: t
 auto-encryption-mode: t
 auto-compression-mode: t
 overwrite-mode: overwrite-mode-binary

Load-path shadows:
/home/wilhelm/.config/emacs/elpa/transient-20230602.2121/transient 
hides /usr/local/share/emacs/30.0.50/lisp/transient

Features:
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Memory information:
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(strings 32 316832 86354) (string-bytes 1 10274587)
(vectors 16 143778) (vector-slots 8 3608027 4190577)
(floats 8 1424 3487) (intervals 56 17512 19707) (buffers 984 69))