Backport of template: protect use of template manager with a lock into release/1.4.x #15201
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Backport
This PR is auto-generated from #15192 to be assessed for backporting due to the inclusion of the label backport/1.4.x.
The below text is copied from the body of the original PR.
This PR protects access to
templateHook.templateManagerwith its lock. Sofar we have not been able to reproduce the panic - but it seems either Poststart
is running without a Prestart being run first (should be impossible), or the
Update hook is running concurrently with Poststart, nil-ing out the templateManager
in a race with Poststart.
Fixes #15189
Backport only to 1.4.x and 1.3.x