Add tooltips in jobs columns

[brianlove]

Add tooltips in the jobs columns providing explanatory information about limitations of the numbers.

Closes #326

[github-actions[bot]]

No need for rebasing :+1: behind_count is 0 ahead_count is 1

[github-actions[bot]]

☂️ Python Coverage

current status: ✅

Overall Coverage

Lines	Covered	Coverage	Threshold	Status
594	423	71%	0%	🟢

New Files

No new covered files...

Modified Files

No covered modified files...

updated for commit: 2b7107a by action🐍

[github-actions[bot]]

JavaScript Coverage

Summary

Lines	Statements	Branches	Functions
	67.91% (398/586)	55.34% (207/374)	68.1% (126/185)

Modified Files • (67%)

File	% Stmts	% Branch	% Funcs	% Lines	Uncovered Line #s
All files	67.91	55.34	68.1	67.69
components	64.75	55.86	62.59	64.33
AddRemoveColumnDialog.jsx	91.66	75	83.33	91.3	79, 99
CellStat.jsx	100	85.71	100	100	63, 75–78
ListViewTable.jsx	91.01	73.83	98.36	90.9	286, 369–370, 375–378, 487, 532, 692, 713–716, 732–733, 757–758, 761, 779–782, 802–807
static_data	67.85	55.17	77.27	65.38
table_columns.js	66.66	55.17	77.27	64	223–576
tooltips.js	100	100	100	100