chore: replace bundlesize with bundlesize2

[devcorpio]

Summary

bundlesize depends on a version of brotli that depends on iltorb 2.4.5 which is an archived repo and it's failing with Node.js 14

This change is recommended by the author of bundlesize.

[apmmachine]

💚 Build Succeeded

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Build stats

• Start Time: 2022-11-07T12:21:11.063+0000

• Duration: 72 min 6 sec

Test stats 🧪

Test	Results
Failed	0
Passed	4740
Skipped	64
Total	4804

🤖 GitHub comments

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To re-run your PR in the CI, just comment with:

• /test : Re-trigger the build.

• run benchmark tests : Run the benchmark test.

• run elasticsearch-ci/docs : Re-trigger the docs validation. (use unformatted text in the comment!)

[apmmachine]

📦 Bundlesize report

Filename	Size(bundled)	Size(gzip)	Diff(gzip)
elastic-apm-opentracing.umd.min.js	66.0 KiB	21.0 KiB	💚 0 Bytes
elastic-apm-rum.umd.min.js	59.9 KiB	19.5 KiB	💚 0 Bytes

[apmmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (8/8)	💚
Files	98.148% (53/54)	❕
Classes	98.148% (53/54)	❕
Methods	97.406% (413/424)	❕
Lines	95.26% (2110/2215)	❕
Conditionals	86.278% (1050/1217)	❕

[kyungeunni]

LGTM!