Upgrade `avatarMiddleware` to `polymiddleware` #3196

Job	Run time
Build	4m 56s
Build samples	26s
Verify build-browser (ubuntu-latest)	53s
Print commit stats	1m 6s
Verify build-browser (macos-26)	44s
Verify build-browser (windows-latest)	1m 56s
Type definitions test	2m 11s
Static code analysis	3m 54s
Unit test	3m 15s
HTML test (6/17)	8m 5s
HTML test (1/17)	7m 12s
HTML test (7/17)	8m 2s
HTML test (9/17)	9m 6s
HTML test (13/17)	7m 29s
HTML test (10/17)	9m 41s
HTML test (15/17)	7m 36s
HTML test (8/17)	8m 14s
HTML test (3/17)	9m 50s
HTML test (2/17)	8m 30s
HTML test (5/17)	8m 56s
HTML test (4/17)	7m 26s
HTML test (16/17)	9m 21s
HTML test (12/17)	7m 50s
HTML test (11/17)	8m 1s
HTML test (17/17)	7m 15s
HTML test (14/17)	8m 11s
Merge test results	26s
Merge test snapshots	5s
	2h 40m 37s

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