Refactoring connection management

[Benjin]

• Lays the groundwork for connection grouping
• Fixes an issue where similar connections could trample each other in the Object Explorer
• cleans up a bunch of duplicate or poorly-named code in connection management

[github-actions]

PR Changes

Category	Main Branch	PR Branch	Difference
Code Coverage	50.42%	51.08%	$${\color{lightgreen} .66\% }$$
VSIX Size	12154 KB	12155 KB	$${\color{lightgreen} 1 KB \space (0\%) }$$
Webview Bundle Size	3188 KB	3188 KB	$${\color{lightgreen} 0 KB \space (0\%) }$$

[Benjin]

update ObjectExplorerUtils.getNodeUri()?

[caohai]

where similar connections could trample each other in the Object Explorer

Do we have an issue for this? Would love to understand how "similar" two connections need to be to trigger this isse, maybe a before/after screenshot with the fix?

[caohai]

LGTM overall, I'd say we might need do more manual testings next week just to make sure this change won't break any existing OE experience.

[Benjin]

@caohai

I'd say we might need do more manual testings next week just to make sure this change won't break any existing OE experience.

Agreed. I really wanted to get this in on the earlier side of a release cycle, but too many things were competing with my time when I wanted to get this PR out. The right call could be to hold this PR after the release branch splits so we can decide whether to take it as a port.