bug#70929: 30.0.50; eglot--apply-text-edits prevents point adjustment

[Troy Brown <brownts@troybrown.dev>]

Language Servers may use onTypeFormatting to provide indentation for a
buffer.  When this happens, the language server will indicate a
newline trigger character (in the DocumentOnTypeFormattingOptions).
In the Emacs buffer, after hitting RET, point is moved to the next
line and a textDocument/onTypeFormatting request is sent from Eglot to
the server.  The server responds back with the corresponding spacing
prefix for the line in newText of the TextEdit response.  However,
when Eglot applies the text edit to insert this spacing, via
eglot--apply-text-edits, it uses save-excursion, and this prevents the
point from being pushed to the end of the inserted spacing.  It would
seem that save-excursion should be avoided when applying text edits.
This issue has been observed with the Ada Language Server.