chore(flagpole-wildcard-ops): Adding support for not_matches op (python)

[Abdkhan14]

Notes:

• In par with sentry-options: chore(flagpole-wildcard-op): Implementing 'not_matches' as a flagpole… sentry-options#127
• Task documentation: link
• Test Duplication: Unlike simpler pairs like in/not_in, glob matching has enough edge cases (overlapping anchors, multi-segment wildcards, case folding) that explicit mirrored coverage is worth it.

Adds a new not_matches condition operator that accepts a list of glob patterns and returns true if the context property value matches none of them. Reuses the existing _glob_star_match helper and _evaluate_matches shared method introduced for matches.

Changes:

src/flagpole/conditions.py — adds NOT_MATCHES to ConditionOperatorKind, refactors MatchesCondition._operator_match into a shared _evaluate_matches method on ConditionBase, adds NotMatchesCondition class (returns not self._evaluate_matches(...)), and registers it in OPERATOR_LOOKUP.

src/flagpole/flagpole-schema.json — adds NotMatchesCondition definition and registers it in the Segment.conditions discriminator and oneOf.

src/sentry/runner/commands/createflag.py — adds NOT_MATCHES to the set of operators that initialize value as a list in the condition wizard.

tests/flagpole/test_conditions.py — adds TestNotMatchesConditions mirroring all TestMatchesConditions cases with inverted assertions: literal match, prefix wildcard, prefix+suffix wildcard, suffix wildcard, multi-star wildcard, star-only pattern, case insensitivity, no-match, multiple patterns, overlapping prefix/suffix anchor guard, and type mismatch errors for list/dict context properties.