Add non supported bugfix and security patch until dates

[geneukum]

Per this message in the ember-js discord, let's add a couple of new columns (Bugfixes until and Security patches until) to the no longer maintained LTS table on the releases/lts route.

While glossing over this, I think that I caught a few instances where we were showing the incorrect minor version / date for a few LTS versions as well, but definitely worth double checking them.

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[kategengler]

Thank you for this; if you're up for another PR after this, I think removing that latest minor version column could be useful. It seems like something that is irksome to keep up to date. We could link to the npm versions page instead https://www.npmjs.com/package/ember-source?activeTab=versions

[geneukum]

Thank you for this; if you're up for another PR after this, I think removing that latest minor version column could be useful. It seems like something that is irksome to keep up to date. We could link to the npm versions page instead https://www.npmjs.com/package/ember-source?activeTab=versions

Sure thing! Good idea to switch the last minor date to the promotion date. I think that it was a little funky because some LTS versions received patches after the cutoffs if I remember correctly.

I'll make a separate PR to drop that column and add some text to link to the versions page on NPM instead.

[kategengler]

@ember-learn/learning-core-team who can review Percy?