feat:add imutable texture flag for Webgl2

[bluesky013]

Re: #

backport from develop
#15250

Changelog

• feat:add imutable texture flag for Webgl2

---

Continuous Integration

This pull request:

• needs automatic test cases check.

  Manual trigger with @cocos-robot run test cases afterward.

• does not change any runtime related code or build configuration

  If any reviewer thinks the CI checks are needed, please uncheck this option, then close and reopen the issue.

---

Compatibility Check

This pull request:

• changes public API, and have ensured backward compatibility with deprecated features.
• affects platform compatibility, e.g. system version, browser version, platform sdk version, platform toolchain, language version, hardware compatibility etc.
• affects file structure of the build package or build configuration which requires user project upgrade.
• introduces breaking changes, please list all changes, affected features and the scope of violation.

[github-actions]

Interface Check Report

! WARNING this pull request has changed these public interfaces:

@@ -8495,9 +8495,10 @@
             GENERAL_LAYOUT = 2,
             EXTERNAL_OES = 4,
             EXTERNAL_NORMAL = 8,
             LAZILY_ALLOCATED = 16,
-            MUTABLE_VIEW_FORMAT = 64
+            MUTABLE_VIEW_FORMAT = 64,
+            MUTABLE_STORAGE = 128
         }
         export enum FormatFeatureBit {
             NONE = 0,
             RENDER_TARGET = 1,