docs: document --include-regex and --exclude-regex for snapshot s3

[mintlify]

Updates the kosli snapshot s3 CLI reference to document the new --include-regex and --exclude-regex path filters introduced in kosli-dev/cli#882.

• Mention regex variants alongside literal-prefix --include/--exclude in the long description
• Add --include-regex and --exclude-regex rows to the Flags table
• Update existing --include/--exclude descriptions to note mutual exclusivity with the new regex flags
• Add an example using --exclude-regex '.*\.png$'

[mintlify]

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Project	Status	Preview	Updated (UTC)
kosli	🟢 Ready	View Preview	May 11, 2026, 5:27 PM