Remove `re2` as a dependency

[AMoo-Miki]

Apparently, re2 is only used to replace patterns in the series labels of Timeline:

OpenSearch-Dashboards/src/plugins/vis_type_timeline/server/series_functions/label.js

Lines 64 to 69 in 86d42bc

	if (config.regex) {
	// not using a standard `import` so that if there's an issue with the re2 native module
	// that it doesn't prevent OpenSearch Dashboards from starting up and we only have an issue using Timeline labels
	const RE2 = require('re2');
	eachSeries.label = eachSeries.label.replace(new RE2(config.regex), config.label);
	} else {

Since re2 doesn't release binaries for all the Node.js versions and architectures that OSD supports, we have been forced to maintain binary releases of our own and all that effort for this task feels unreasonable to me.

I feel like using the native RegExp would be sufficient here.