fix(runtime-core): Fix cssVar cannot work in teleport

[tinyfind]

close: #7312
close: #7342

[skirtles-code]

Could you maybe explain how your proposed solution compares to the existing PRs for those two issues?

• fix(runtime-core): Fix cssvars reporting error when teleport is disabled #7341
• fix(runtime): CSSVars can work with Teleport #7344

[tinyfind]

discard use css attribute data-v-owner that cancel updateCssVars limit browser environment only, so #7341 get fixed
modify updateCssVars make cssVar can work in multilevel nesting teleport

core/packages/runtime-core/src/components/Teleport.ts

Line 401 in fe77e2b

// code path here can assume browser environment.

modify setVarsOnVNode add handle for Teleport vnode and use MutationObserver to trigger that #7342 get fixed

[tinyfind]

@sxzz can you help me to review.

[pikax]

@tinyfind can you provide answers for skirtles questions please?

Could you maybe explain how your proposed solution compares to the existing PRs for those two issues?

• fix(runtime-core): Fix cssvars reporting error when teleport is disabled #7341
• fix(runtime): CSSVars can work with Teleport #7344