Handle errors in mysqli_begin_transaction

[kamil-tekiela]

No description provided.

[jorgsowa]

Please don't use Squashed commit of the following: or similar as commit title. It's hard to track changes this way.

[kamil-tekiela]

Please don't use Squashed commit of the following: or similar as commit title. It's hard to track changes this way.

I know, sorry. I only noticed after I pushed. I thought the branch name would be the commit name by default after squash.

[TimWolla]

I just needed to bisect for this change, because it did not appear in the changelog. NEWS was not properly updated:

• For PHP-8.3 it was added to 8.3.29 (which had already been branched at that point).
• For PHP-8.4 it was added to 8.4.16 (which had already been branched at that point).
• For PHP-8.5 it was added to 8.5.1 (which had already been branched at that point).

And I was also confused by the NEWS merges, since it appears that the merge from 8.3 to 8.4 dropped the NEWS item for a1912e3 and 159ef14, but from what I see those NEWS entry were not properly added to 8.4 and higher in the first place. /cc @ndossche

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Since this change has a non-trivial chance making broken code more visible (by suddenly throwing exceptions instead of silently failing), we should make sure that it is properly listed in all changelogs.

/cc @php/release-managers-83 @php/release-managers-84 @php/release-managers-85