chore(release): 6.0.0-rc.1

# [6.0.0-rc.1](v5.69.0...v6.0.0-rc.1) (2025-08-21)

### Bug Fixes

* add  browser header for test case ([#1889](#1889)) ([1a3383a](1a3383a))
* searchbnf.conf issue ([#1860](#1860)) ([58f62c3](58f62c3))

### Features

* **custom command:** test-ucc-ui as custom ui test command ([#1834](#1834)) ([6855964](6855964))
* custom menu removal ([df62075](df62075))
* do not support auth_entity property in auth entities ([b3bc78d](b3bc78d))
* init commit with drop 37 and 38 in workflows ([5ab0d90](5ab0d90))
* remove placeholder from test and docs ([030111e](030111e))
* remove require js (amd) approach for custom elements ([46b39ba](46b39ba))
* remove support for --ui-source-map ([3bc7958](3bc7958))
* remove support for .uccignore ([7c324cf](7c324cf))

### Reverts

* merging of .conf files ([#1873](#1873)) ([1c93133](1c93133)), closes [#1800](#1800) [#1832](#1832)

### BREAKING CHANGES

* remove placeholder from test and docs
* remove support for .uccignore
* remove require js (amd) approach for custom elements
* do not support auth_entity property in auth entities
* remove support for --ui-source-map
* custom menu removal
* init commit with drop 37 and 38 in workflows

Author: srv-rr-github-token