[develop2] add pkg name in new cache path hashes

[memsharded]

Changelog: Feature: Add package names in Conan cache hash paths.

Today I have missed hints in paths while debugging...

I am trying this approach:

• Reducing the hash length in 3 characters 16=>13
• Adding first 5 characters of package name => total unique identifier = 13+5 = 18
• Given that package names are also distinct, the entropy should be equal, or even better
• The 2 extra characters in length, can be removed from the identifier "tmp" used for temporal builds "tmp"->"t". Given that packages store is just "p", I don't think this will worsen debuggability. So the total path length remains the same.

(also removing some closedb code, apparently dead)

Close #12952