Slight improvement of the ACL error message

[frouioui]

Description

This pull request improves the ACL error message. The original error message was constructed as follows:

"table acl error: <USERNAME> [<GROUPS>] cannot run <QUERY TYPE> on table <TABLE NAME>"

The first suggestion made by @deepthi, and pushed to this PR via d0db975, looks as follows:

"authorization error: user <USERNAME> is not authorized to run <QUERY TYPE> on table <TABLE NAME>"

Another suggestion which was to use MySQL's error message would look as follows:

"<QUERY TYPE> command denied to user '<USERNAME>' for table '<TABLE NAME>'"

This pull request is open to suggestions.

Checklist

• Should this PR be backported?
• Tests were added or are not required
• Documentation was added or is not required

[mattlord]

IMO, the more closely we mimic mysqld from the client's perspective the better -- so I'd vote for doing that here. So perhaps:

SELECT command denied to user 'myappusr' for table 'foo' (ACL check error)

That way we also note the internal vitess area in parenthesis.

[frouioui]

@mattlord, that's a good idea. I've applied the suggestion through 498f1dd.

Minor difference with MySQL is that the plan name is printed in pascal case instead of upper case. This is meant to avoid long and odd strings like SHOWMIGRATIONLOGS, and instead, print ShowMigrationLogs.

[deepthi]

@frouioui unit_race seems to be flaky. Can we move it to self-hosted runner?
cc @GuptaManan100

[Phanatic]

Looks great! I left a comment about retaining Groups information in the error message.

[frouioui]

@frouioui unit_race seems to be flaky. Can we move it to self-hosted runner?
cc @GuptaManan100

Created #8854 to migrate this test to our self-hosted runners.