Updated SSLSNIConfig to use the Regex class (pcre2)

[bryancall]

No description provided.

[Copilot]

Pull Request Overview

This PR updates the regex functionality in SSLSNIConfig to use the new Regex class based on PCRE2 instead of legacy PCRE usage. It introduces a move assignment operator and an empty() helper in the Regex class, updates regex compilation and execution in SSLSNIConfig, and removes obsolete PCRE includes.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
src/tsutil/Regex.cc	Added move assignment operator and empty() method; adjusted exec() behavior to update match vector size.
include/tsutil/Regex.h	Added declaration for move assignment operator and empty() method.
src/iocore/net/SSLSNIConfig.cc	Replaced PCRE API calls with Regex class methods and updated capture groups handling.
include/iocore/net/SSLSNIConfig.h	Removed PCRE header inclusion and updated NamedElement's regex member to use Regex.