[Tigron]: roadmap and tracking epic for work on test tooling

[apostasie]

PR

Pending review

• [CI] new command implementation for tests #4056
• [Tigron]: mocks + debugging output enhancements #4076
• [STACKED] [Tigron]: expect.JSON comparator and updated volume test #4079
• [STACKED] [WIP] [UX feedback requested]: testing logs user experience #4080

Work in progress

• [STACKED] [WIP] [Tigron]: revised Data interface #4081

Test suites to rewrite

• STARTED: builder
• completion
• TODO: compose
• STARTED: container
• image
• ipfs
• STARTED: login
• network
• system
• volume
• main

Issues and features

• P0: Manager is evaluated before the command runs, while the Comparator in Output is evaluated after - this is confusing and prevents legit scenarios. Manager should only be evaluated after the command has run.
• P0: rethink Data - need something to manipulate temp files ([STACKED] [WIP] [Tigron]: revised Data interface #4081)
• P0: remove dependency on *testing.T and replace by tig.T everywhere
• P1: following the rewrite of Command, test.Command is now a (mostly) empty shell - cleanup / refactor
• P1: reintroduce Env, WD, etc to the command debug output
• P1: add Config/Data details to the debug output
• P1: API breaking: change comparators signature (remove info + tig.T)
• P1: currently, the command is executing inside data.TempDir(), so, there is no distinction between . and TempDir from the command perspective. We may want to address that.
• P1: missing something like .AddCleanup() when a routine inside Setup does want to add additional cleaning
• P1: requirements should be able to manipulate the environment
• P2: use of data.Identifier in subtests hoping to get the parent testid may be error prone - rethink Identifier()?