TST/CLN: deduplicate fixture from test_to_latex.py

[simonjayhawkins]

this PR is basically just to promote the float_frame fixture to top-level conftest.

once there, there is opportunities to re-use by fixturising current instances of

df = DataFrame(tm.getSeriesData())

also allows removing duplicate fixture from pandas/tests/io/formats/test_to_latex.py

so this is just a move for now, fixturization in follow-on PRs

[jreback]

lgtm. CI failing on doc build, so will merge after that is disabled.

[codecov]

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@@            Coverage Diff            @@
##             master   #26603   +/-   ##
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Flag	Coverage Δ
#multiple	90.38% <ø> (?)
#single	41.76% <ø> (?)

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[jreback]

i think i accidentally cancellled this one
can u merge master and ping on green

[simonjayhawkins]

@jreback all green

[WillAyd]

Thanks @simonjayhawkins