Merge runtime / runtime-only

[pgherveou]

Move runtime as an associated value of the variant RuntimeOnly.

Todo:

• Update doc

[pgherveou]

@pmikolajczyk41 does it make sense to have both fields rather than 1 variant with associated type?
feel free to close if this is completely stupid 🙃

[pgherveou]

@SkymanOne updated.
tldr the associated type force you to at least specify the backend like this to use the default runtime

 #[ink_e2e::test(backend(runtime_only()))]
// you need the () after runtime_only

specifying a custom one is done with

 #[ink_e2e::test(backend(runtime_only(runtime = ink_e2e::MinimalRuntime)))]

e2e tests run by default or I need to trigger them manually, to check nothing is broken?

[codecov-commenter]

Codecov Report

Merging #1968 (ad73049) into master (02c4f0d) will decrease coverage by 0.03%.
Report is 17 commits behind head on master.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master    #1968      +/-   ##
==========================================
- Coverage   52.92%   52.90%   -0.03%     
==========================================
  Files         219      219              
  Lines        6781     6780       -1     
==========================================
- Hits         3589     3587       -2     
- Misses       3192     3193       +1     

Files	Coverage Δ
crates/e2e/macro/src/config.rs	90.00% <100.00%> (-1.67%)	⬇️
crates/e2e/macro/src/codegen.rs	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes

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[pmikolajczyk41]

very good idea, thanks!