UI templates are configurable, users might add or remove configs
as they want, so we don't need to throw exception for inexistent
paths, this allow users to remove templates they don't want, or
even disable the `ui_template` index.

* Revert #8066

* Update changelog

Add `forEach`, `processRelation` function to MAL Expression, and add `expPrefix` and `initExp` in MAL config (#9299)

Signed-off-by: Ncui fliter <imcusg@gmail.com>

* Sync UI

* Update Java agent and satellite commit ID for testing.

* Fix e2e

* Fix Satellite plugin names
Co-authored-by: Nwankai123 <wankai123@foxmail.com>
Co-authored-by: mrproliu <741550557@qq.com>

Co-authored-by: Nraymond.chen <raymond.chen@yijinin.com>

Mesh: fix only last rule works when multiple rules are defined in metadata-service-mapping.yaml (#9205)

* [maven-release-plugin] prepare release v9.1.0

* [maven-release-plugin] prepare for next development iteration