TST: [ArrowStringArray] add dtype parameterisation to test_astype_float and test_fillna_args #40677
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#35259 added dtype parameterisation to existing tests in pandas/tests/arrays/string_/test_string.py and xfailed for ArrowStringArray where needed.
test_astype_float and test_fillna_args were later added in #37974 and #37987 respectively.
This PR doesn't fix (although will be looking at the all the xfailed tests in this module shortly, #35169 (comment)) just xfails to reduce the diff (slightly) for #39908