Draft: Fix selection when adding a link via shortcut

What does this MR do and why?

Previously, we linking a text which contained the word url we would preselect the first occurrence instead of the last.

Closes #207507.

For example:

Given the following text:

some fancy url

When selecting this text

>some fancy url<

And pressing CTRL+K it would add a link and preselect some fancy >url<:

[some fancy >url<](url)

With this commit we preselect the last occurrence as expected:

[some fancy url](>url<)

Caught during !98505 (comment 1129846238)

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Open a note in an issue or MR
2. Type some fancy url
3. Select the written word
4. Press CTRL+K or Command+K
5. Verify preselected url word

MR acceptance checklist

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