Short rule messages should not end with a period (#9345)

## Summary

Remove the period from a couple short messages, for consistency with all
other short messages.

All other short rule messages lack such a period, except for long
messages made of multiple sentences.

## Test Plan

Tests modified accordingly.

Not sure if this would qualify as a breaking change because user-visible
messages are modified.

crates/ruff_linter/src/rules/flake8_comprehensions/rules/unnecessary_comprehension_any_all.rs

@@ -53,7 +53,7 @@ impl Violation for UnnecessaryComprehensionAnyAll {
 
     #[derive_message_formats]
     fn message(&self) -> String {
-        format!("Unnecessary list comprehension.")
+        format!("Unnecessary list comprehension")
     }
 
     fn fix_title(&self) -> Option<String> {

crates/ruff_linter/src/rules/flake8_comprehensions/snapshots/ruff_linter__rules__flake8_comprehensions__tests__C419_C419.py.snap

@@ -1,7 +1,7 @@
 ---
 source: crates/ruff_linter/src/rules/flake8_comprehensions/mod.rs
 ---
-C419.py:1:5: C419 [*] Unnecessary list comprehension.
+C419.py:1:5: C419 [*] Unnecessary list comprehension
   |
 1 | any([x.id for x in bar])
   |     ^^^^^^^^^^^^^^^^^^^ C419
@@ -17,7 +17,7 @@ C419.py:1:5: C419 [*] Unnecessary list comprehension.
 3 3 | any(  # first comment
 4 4 |     [x.id for x in bar],  # second comment
 
-C419.py:2:5: C419 [*] Unnecessary list comprehension.
+C419.py:2:5: C419 [*] Unnecessary list comprehension
   |
 1 | any([x.id for x in bar])
 2 | all([x.id for x in bar])
@@ -35,7 +35,7 @@ C419.py:2:5: C419 [*] Unnecessary list comprehension.
 4 4 |     [x.id for x in bar],  # second comment
 5 5 | )  # third comment
 
-C419.py:4:5: C419 [*] Unnecessary list comprehension.
+C419.py:4:5: C419 [*] Unnecessary list comprehension
   |
 2 | all([x.id for x in bar])
 3 | any(  # first comment
@@ -56,7 +56,7 @@ C419.py:4:5: C419 [*] Unnecessary list comprehension.
 6 6 | all(  # first comment
 7 7 |     [x.id for x in bar],  # second comment
 
-C419.py:7:5: C419 [*] Unnecessary list comprehension.
+C419.py:7:5: C419 [*] Unnecessary list comprehension
   |
 5 | )  # third comment
 6 | all(  # first comment
@@ -77,7 +77,7 @@ C419.py:7:5: C419 [*] Unnecessary list comprehension.
 9 9 | any({x.id for x in bar})
 10 10 | 
 
-C419.py:9:5: C419 [*] Unnecessary list comprehension.
+C419.py:9:5: C419 [*] Unnecessary list comprehension
    |
  7 |     [x.id for x in bar],  # second comment
  8 | )  # third comment
@@ -98,7 +98,7 @@ C419.py:9:5: C419 [*] Unnecessary list comprehension.
 11 11 | # OK
 12 12 | all(x.id for x in bar)
 
-C419.py:24:5: C419 [*] Unnecessary list comprehension.
+C419.py:24:5: C419 [*] Unnecessary list comprehension
    |
 22 |   # Special comment handling
 23 |   any(
@@ -133,7 +133,7 @@ C419.py:24:5: C419 [*] Unnecessary list comprehension.
 31 30 | )
 32 31 | 
 
-C419.py:35:5: C419 [*] Unnecessary list comprehension.
+C419.py:35:5: C419 [*] Unnecessary list comprehension
    |
 33 |   # Weird case where the function call, opening bracket, and comment are all
 34 |   # on the same line.

crates/ruff_linter/src/rules/ruff/rules/invalid_index_type.rs

@@ -41,10 +41,10 @@ impl Violation for InvalidIndexType {
             is_slice,
         } = self;
         if *is_slice {
-            format!("Slice in indexed access to type `{value_type}` uses type `{index_type}` instead of an integer.")
+            format!("Slice in indexed access to type `{value_type}` uses type `{index_type}` instead of an integer")
         } else {
             format!(
-                "Indexed access to type `{value_type}` uses type `{index_type}` instead of an integer or slice."
+                "Indexed access to type `{value_type}` uses type `{index_type}` instead of an integer or slice"
             )
         }
     }