misc: restore build size bot

[slorber]

After investigating a security issue using pull_request_target, we decided to finally keep build size bot but using pull_request.

It solves the security issue, but this means the build size bot won't be able to post a PR comment if the PR is from a fork.

See preactjs/compressed-size-action#54
See https://securitylab.github.com/research/github-actions-preventing-pwn-requests

[github-actions]

Size Change: 0 B

Total Size: 528 kB

ℹ️ View Unchanged

Filename	Size	Change
./packages/core/dist/css/default-dark/default-dark-rtl.css	76.6 kB	0 B
./packages/core/dist/css/default-dark/default-dark-rtl.min.css	53.3 kB	0 B
./packages/core/dist/css/default-dark/default-dark.css	76.6 kB	0 B
./packages/core/dist/css/default-dark/default-dark.min.css	53.3 kB	0 B
./packages/core/dist/css/default/default-rtl.css	75.8 kB	0 B
./packages/core/dist/css/default/default-rtl.min.css	52.8 kB	0 B
./packages/core/dist/css/default/default.css	75.7 kB	0 B
./packages/core/dist/css/default/default.min.css	52.8 kB	0 B
./packages/core/dist/js/alerts.js	409 B	0 B
./packages/core/dist/js/alerts.min.js	409 B	0 B
./packages/core/dist/js/button-groups.js	267 B	0 B
./packages/core/dist/js/button-groups.min.js	267 B	0 B
./packages/core/dist/js/dropdowns.js	1.01 kB	0 B
./packages/core/dist/js/dropdowns.min.js	1.01 kB	0 B
./packages/core/dist/js/menu.js	1.74 kB	0 B
./packages/core/dist/js/menu.min.js	1.74 kB	0 B
./packages/core/dist/js/navbar.js	926 B	0 B
./packages/core/dist/js/navbar.min.js	926 B	0 B
./packages/core/dist/js/pills.js	270 B	0 B
./packages/core/dist/js/pills.min.js	270 B	0 B
./packages/core/dist/js/radio-behavior.js	705 B	0 B
./packages/core/dist/js/radio-behavior.min.js	705 B	0 B
./packages/core/dist/js/tabs.js	267 B	0 B
./packages/core/dist/js/tabs.min.js	267 B	0 B

_{compressed-size-action}

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