Release 1.26.0b1

What's Changed

• build: create release flow for v2.x by @hallvictoria in #319
• build: skip tests on 3.10 - 3.12 if version is 2.x by @hallvictoria in #321
• build: migrate to Central Feed Services by @hallvictoria in #323
• build: fix internal feed name by @hallvictoria in #324
• build: update Python Library Version to 2.1.0 by @hallvictoria in #327
• feat: add support for structured content for MCP by @hallvictoria in #318
• build: update Python Library Version to 1.26.0b1 by @hallvictoria in #328

Full Changelog: 1.25.0b4...1.26.0b1