[combobox] Add chipsContainerRef to getInsideElements in ComboboxPopup

[sai6855]

• I have followed (at least) the PR section of the contributing guide.

[pkg-pr-new]

• base-ui-tanstack-start

• vite-css-base-ui-example

  pnpm add https://pkg.pr.new/mui/base-ui/@base-ui/react@5546
  

  pnpm add https://pkg.pr.new/mui/base-ui/@base-ui/utils@5546
  

commit: dec9989

[code-infra-dashboard]

Bundle size

Bundle	Parsed size	Gzip size
@base-ui/react	🔺+34B(+0.01%)	▼-2B(0.00%)

Details of bundle changes

Performance

Total duration: 1,037.87 ms +64.64 ms^(+6.6%) | Renders: 92 ⁽⁺⁰⁾ | Paint: 1,731.19 ms +112.99 ms^(+7.0%)

Test	Duration	Renders
Menu open (500 items)	82.13 ms +10.65 ms(+14.9%)	11 (+0)

14 tests within noise — details

Metric alarms

Test	Metric	Change
Menu open (500 items)	bench:paint	🔺 +31.78 ms
Menu open (500 items)	bench:paint#menu-open	🔺 +31.78 ms

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