[llvm] [llvm-ir2vec] Refactoring the ir2vec python bindings testing (PR #180664)

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``````````bash
darker --check --diff -r origin/main...HEAD llvm/test/tools/llvm-ir2vec/bindings/ir2vec-getBBEmbMap.py llvm/test/tools/llvm-ir2vec/bindings/ir2vec-getFuncEmb.py llvm/test/tools/llvm-ir2vec/bindings/ir2vec-getFuncEmbMap.py llvm/test/tools/llvm-ir2vec/bindings/ir2vec-getFuncNames.py llvm/test/tools/llvm-ir2vec/bindings/ir2vec-getInstEmbMap.py llvm/test/tools/llvm-ir2vec/bindings/ir2vec-initEmbedding.py
``````````

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``````````diff
--- ir2vec-initEmbedding.py	2026-02-09 14:12:28.000000 +0000
+++ ir2vec-initEmbedding.py	2026-02-10 01:58:51.384256 +0000
@@ -40,11 +40,12 @@
 # CHECK: ERROR: Invalid vocab
 
 # Error: Malformed JSON vocab
 import tempfile
 import os
-with tempfile.NamedTemporaryFile(mode='w', suffix='.json', delete=False) as f:
+
+with tempfile.NamedTemporaryFile(mode="w", suffix=".json", delete=False) as f:
     f.write("{ this is not valid json }")
     bad_vocab = f.name
 try:
     ir2vec.initEmbedding(filename=ll_file, mode="sym", vocabPath=bad_vocab)
 except ValueError:

``````````

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https://github.com/llvm/llvm-project/pull/180664