Fix v1.9.0 testing

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Content

• Adds >=v1.9 tests where behaviour changes.
  Changes weres isolated to Failure handler tests, as the most up-to-date LinearAlgebra no longer allows as much propagation of NaNs, rather it throws errors. (I think this is a good idea)
• Removes the various precompile warnings about "FT defined but not used"
• Removes the precompile warning of a clash in sample by now importing GaussianRandomFields rather that using it. This is (I think) because GRF.jl does not extend the StatsBase sample function, and we cant import StatsBase: sample AND using GaussianRandomFields without warnings.
• Update github workflows for docs and formatter to include v1.X from pinning to 1.7

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• I have read and checked the items on the review checklist.

[odunbar]

Merge without review, when all checks pass for both v1.6 and v1.9.0

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bors r+

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• docs-build
• format
• test_success