Ensure back-supported jinja2 deprecations warn about removal in Cylc 8.8 - #7436
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* Back support Jinja2 interfaces deprecated at 3.0 and removed at 3.1. * Jinja2 renamed a bunch of functions and deprecated their old names. * Our users didn't spot this as Python warnings are not visible to them. * As of cylc#7365 (8.6.6) Python warnings originating from Jinja2 will be turned into Cylc warnings. * To provide a migration window, the old function names will be supported in Cylc 8.7.x and removed in 8.8.0.
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Think this makes sense, managed to create a right tangle of changes there!
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Closes #7376
Follow-up to #7365 which made sure any Jinja deprecation warnings are displayed to users. These include a bunch of functions removed in Jinja 3.1, which currently we warn will break in Cylc 8.7.0.
Follow-up to #7325 which provided extended support for some of these functions on master, meaning that the warnings for these should now read 8.8.0.
The solution is simply cherry-picking the extended support from #7325.
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CONTRIBUTING.mdand added my name as a Code Contributor.?.?.xbranch.