NocoBase v2.0.0-alpha.8: Improve web search function of plugin-ai

[client] In order to get more accurate MIME type of file, use mime package to detect MIME type of file in client (#7551) by @mytharcher
[flow-engine]
- support popup variable (#7583) by @gchust
- Enhance the code editing experience with richer snippets and context-aware code completions for various scenarios (#7559) by @gchust
- Standardized automatic workflows to be consistently triggered by the “beforeRender” event, ensuring predictable and unified operation across processes. (#7577) by @gchust
[Workflow] Add keepBranch option when deleting node (#7571) by @mytharcher
[Data visualization] Expand chart types; Optimize UI and interactive experience. (#7581) by @heziqiang
[Workflow: Approval] Refactor branch configuration to adapt to kernel changes by @mytharcher

[client]
- Fix abnormal page display issues when switching table pagination (#7572) by @zhangzhonghe
- Can’t configure assign field value for Update and Bulk update action (#7565) by @gchust
- Fix the issue where images did not display correctly when both rotated and scaled during preview (#7573) by @mytharcher
[Workflow: Approval] Fix the issue of migration script errors due to non-existent tables when the application is not installed by @mytharcher
[Auth: LDAP] Fix LDAP bind failure with non-ASCII (UTF-8) DNs in Active Directory by @2013xile