[ruff] if k in d: del d[k] (RUF051) (#14553)

## Summary

Resolves #7537.

## Test Plan

`cargo nextest run` and `cargo insta test`.

---------

Co-authored-by: Micha Reiser <micha@reiser.io>

crates/ruff_linter/resources/test/fixtures/ruff/RUF051.py

@@ -0,0 +1,130 @@
+d = {}
+l = []
+
+
+### Errors
+
+if k in d:                          # Bare name
+    del d[k]
+
+if '' in d:                         # String
+    del d[""]                       # Different quotes
+
+if b"" in d:                        # Bytes
+    del d[                          # Multiline slice
+        b''''''                     # Triple quotes
+    ]
+
+if 0 in d: del d[0]                 # Single-line statement
+
+if 3j in d:                         # Complex
+    del d[3j]
+
+if 0.1234 in d:                     # Float
+    del d[.1_2_3_4]                 # Number separators and shorthand syntax
+
+if True in d:                       # True
+    del d[True]
+
+if False in d:                      # False
+    del d[False]
+
+if None in d:                       # None
+    del d[
+        # Comment in the middle
+        None
+    ]
+
+if ... in d:                        # Ellipsis
+    del d[
+                                    # Comment in the middle, indented
+        ...]
+
+if "a" "bc" in d:                   # String concatenation
+    del d['abc']
+
+if r"\foo" in d:                    # Raw string
+    del d['\\foo']
+
+if b'yt' b'es' in d:                # Bytes concatenation
+    del d[rb"""ytes"""]             # Raw bytes
+
+if k in d:
+    # comment that gets dropped
+    del d[k]
+
+### Safely fixable
+
+if k in d:
+    del d[k]
+
+if '' in d:
+    del d[""]
+
+if b"" in d:
+    del d[
+        b''''''
+    ]
+
+if 0 in d: del d[0]
+
+if 3j in d:
+    del d[3j]
+
+if 0.1234 in d:
+    del d[.1_2_3_4]
+
+if True in d:
+    del d[True]
+
+if False in d:
+    del d[False]
+
+if None in d:
+    del d[
+        None
+    ]
+
+if ... in d:
+    del d[
+        ...]
+
+if "a" "bc" in d:
+    del d['abc']
+
+if r"\foo" in d:
+    del d['\\foo']
+
+if b'yt' b'es' in d:
+    del d[rb"""ytes"""]             # This should not make the fix unsafe
+
+
+
+### No errors
+
+if k in l:                          # Not a dict
+    del l[k]
+
+if d.__contains__(k):               # Explicit dunder call
+    del d[k]
+
+if a.k in d:                        # Attribute
+    del d[a.k]
+
+if (a, b) in d:                     # Tuple
+    del d[a, b]
+
+if 2 in d:                          # Different key value (int)
+    del d[3]
+
+if 2_4j in d:                       # Different key value (complex)
+    del d[3.6]                      # Different key value (float)
+
+if 0.1 + 0.2 in d:                  # Complex expression
+    del d[0.3]
+
+if f"0" in d:                       # f-string
+    del d[f"0"]
+
+if k in a.d:                        # Attribute dict
+    del a.d[k]