Update... & Update All... one click commands in Solution Explorer (Context Menu)

[donnie-msft]

From PM Tracking Issue: Show NuGet commands in context menu: #8041

From @chgill-MSFT 02/11/20: Relevant design spec can be found here: https://github.com/NuGet/Home/wiki/Update-Command-in-Context-Menu

[donnie-msft]

Bringing this into the Sprint based on these details provided today via email by @rrelyea and @anangaur:

Update… context menu option for Packages and which just brings up the Package Manager UI in the Update tab.

for the update option on a NuGet package, it should bring up the updates tab, with that package selected

[anangaur]

Where

NetCore (SDK style)

• Project\Dependencies\Packages: Update All...
• Project\Dependencies\Packages\MyPackage: Update...

csproj.dll PR

• Project\References\MyPackage: Update...

packages.config

• Project\References\MyPackage: Update...

Behavior

• Update...: Open PM UI updates tab listing all packages needing an update, with the in-context package selected and details on the right hand side lit up. Essentially one click on 'Update' should be all it should take for the developer to update the package.
• Update All..: Open PM UI updates tab

[donnie-msft]

• Update All..: Open PM UI updates tab

Revision: Open PM UI updates tab and check all packages there.

[donnie-msft]

Dependent Project System changes are being tracked here: dotnet/project-system#5798

[anangaur]

/cc: @chgill-MSFT

[nkolev92]

Duplicate reported in #11547.

I happen to find #1684 as well.

Probably should close in favor of the other.

Moved #1684 to the New Issues column for triage.