Eglot: try again to fix try-completion logic

Emacs partial completion simply doesn't make sense in LSP.
Attempts to make it make some sense end up failing for one
reason or another.

This commit restores the original intention of the
eglot--dumb-allc and eglot--dumb-tryc functions, which was to be
dumb and pop up a *Completions* buffer (or a company tooltip),
as soon as there is doubt over what the user wants to do.

It also fixes tests, including an expensive Rust test that had
been broken for a long time.

* lisp/progmodes/eglot.el (eglot--dumb-allc): Consider point.
(eglot--dumb-tryc): Make it suitably dumb again.

* test/lisp/progmodes/eglot-tests.el
(eglot--wait-for-rust-analyzer): Wait longer.
(eglot-test-common-prefix-completion): Delete this test.  It's not
the intended behavior.
(eglot--kill-completions-buffer): New helper.
(eglot-test-try-completion-nomatch): Rework test.
(eglot-test-try-completion-inside-symbol): Pops *Completions*
buffer because mustn't partial complete.
(eglot-test-try-completion-inside-symbol-2): Does complete.
(eglot-test-rust-completion-exit-function): Fix long-broken test.

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