[kueue-viz] Change backend port to 8181

[SD-13]

What type of PR is this?

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #3880

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

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[mbobrovskyi]

/release-note-edit

NONE

[mbobrovskyi]

/retitle [kueue-viz] Change backend port to 8181