test-compat: merge with mercurial-4.1 hg log has no trouble field in mercurial 4.0, output fixed.

test-compat: merge with stable Nothing special to report, minor test-metaedit.t output change.

merge with default

compat: fix stablerange for mercurial 3.9 Lrudict.get change of api between mercurial 3.9 and mercurial 4.2. Bypass this limitation by using lrudict.__getitem__ and catch the KeyError directly.

template: fix successors and precursors templates In mercurial 4.1-, the gen argument is expected to be an iterator and not an iterable, fix successors and precursors templates.

lint: remove double newline in test file Test file test-stablesort-criss-cross.t contained two double newline, I remove them.

template: fix precursors template for older mercurial version In mercurial 4.1 and below templatekw._hybrid require the gen argument to be different than None. Manually compute the same default output for these older mercurial versions.

compatibility: backport mercurial 176d1a0ce385 Backport obsstore.relevantmarkers change for including previously forgotten pruned obs markers. Target mercurial version lesser than 4.3. This impact multiple tests. All test changes has been manually checked. Since the computation of relevant obsmarkers have changed, we are bumping the cache schema version. So that caches get recomputed.

evolve: fix import order

compat: adapt to buildobsmarkerspart move The function has been moved in e70d6dbde713 so we must we search in both location.