fix(cosmosdb): remove duplicate angle bracket tokens to resolve lexer conflicts

Remove LA_BRACKET_SYMBOL and RA_BRACKET_SYMBOL tokens that were conflicting with LESS_THAN_OPERATOR and GREATER_THAN_OPERATOR. The angle bracket symbols are now properly defined as comparison operators.

This fixes ANTLR warnings about unreachable token values.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: h3n4l

cosmosdb/CosmosDBLexer.g4

@@ -54,8 +54,6 @@ LS_BRACKET_SYMBOL: '[';
 RS_BRACKET_SYMBOL: ']';
 LR_BRACKET_SYMBOL: '(';
 RR_BRACKET_SYMBOL: ')';
-LA_BRACKET_SYMBOL: '<';
-RA_BRACKET_SYMBOL: '>';
 SINGLE_QUOTE_SYMBOL: '\'';
 DOUBLE_QUOTE_SYMBOL: '"';
 COMMA_SYMBOL: ',';