Revert the removal of the MySQL binaries in the vitess/lite image

[frouioui]

Description

We have been facing multiple issues after we merged #15620. Mainly, the xtrabackup and mysqlbinlog binaries were missing and thus we could not use certain features of vitess. There was several attempts to fix this: #15775 and #15854, which both failed. We have a plan internally on how to make this work, but as of today (1 day before the code freeze of v20) I have not been able to make that plan work, hence the revert.

[vitess-bot]

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[frouioui]

Symlink was broken on main for some time

[frouioui]

In the v19.0.0 release notes we say the following:

The mysqld binary is now deprecated in the vitess/lite Docker image and will be removed in a future release.

Thus, other than removing the release notes we added in v20 I don't think there is anything else needed here.

We are removing the mysql-57 and percona-57 images but that's a side effect of dropping support for 5.7 in v19

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.23%. Comparing base (f4591fb) to head (bf65ce5).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #16042   +/-   ##
=======================================
  Coverage   68.23%   68.23%           
=======================================
  Files        1541     1541           
  Lines      197254   197254           
=======================================
  Hits       134597   134597           
  Misses      62657    62657           

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[deepthi]

DCO is down, so I have manually verified that commits 6e204ad6fc1e3d46ef7a7aa66e5d2ed9ae5eaef0 and bf65ce510104a8f568d1df302bb13e680407e647 have been correctly signed off. Any future commits based on reviews will also need to manually verified until DCO comes back.

[frouioui]

Forced merge this using allow by-pass