feat(rum-oversight): split draw from loadData

[karlpauls]

Currently, the loadData method is calling draw at the end. This causes some duplicated call to the draw method of the chart - it doesn't really seem to be a performance problem (nor cause other issues) but it seems it would make some sense to move the draw call out of loadData and invoke it explicitly when needed.

Test: https://slicerdraw--helix-website--karlpauls.hlx.page/tools/oversight/explorer.html?domain=aem.live&domainkey=

[aem-code-sync[bot]]

	Page	Scores	Audits	Google
M	/tools/oversight/explorer.html?domain=aem.live&domainkey=
D	/tools/oversight/explorer.html?domain=aem.live&domainkey=

[kptdobe]

Can we also get the patch for the explorer ?