ref: Drop no-plusplus rule & refactor to use ++ / --

[mydea]

This PR removes the no-plusplus eslint rule, as it doesn't really apply to us. By replacing usage of a += 1 with a++, and a -= 1 with a-- we should actually be able to shave a few bytes off our bundles.

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser - ES5 CDN Bundle (gzipped + minified)	19.53 KB (-0.02% 🔽)
@sentry/browser - ES5 CDN Bundle (minified)	60.42 KB (-0.02% 🔽)
@sentry/browser - ES6 CDN Bundle (gzipped + minified)	18.21 KB (+0.02% 🔺)
@sentry/browser - ES6 CDN Bundle (minified)	53.76 KB (-0.02% 🔽)
@sentry/browser - Webpack (gzipped + minified)	19.94 KB (+0.01% 🔺)
@sentry/browser - Webpack (minified)	65.25 KB (-0.02% 🔽)
@sentry/react - Webpack (gzipped + minified)	19.96 KB (+0.01% 🔺)
@sentry/nextjs Client - Webpack (gzipped + minified)	45.96 KB (-0.01% 🔽)
@sentry/browser + @sentry/tracing - ES5 CDN Bundle (gzipped + minified)	26.41 KB (-0.03% 🔽)
@sentry/browser + @sentry/tracing - ES6 CDN Bundle (gzipped + minified)	24.83 KB (-0.01% 🔽)
@sentry/replay index.js	83.65 KB (-0.07% 🔽)
@sentry/replay - Webpack (gzipped + minified)	83.67 KB (-0.07% 🔽)
@sentry/replay - Webpack (minified)	272.53 KB (-0.06% 🔽)