Improve CI testing

[jedel1043]

Just some small improvements in our CI to ensure we're testing everything.

One unfortunate thing I realized is that cargo clippy -- -D warnings apparently doesn't work with our current setup, somehow. I think clippy is interpreting our crate global warns as overriding the command argument -D warnings, but it seems that this was fixed on rust-lang/rust-clippy#5749. Maybe the bug reappeared for workspaces?

Anyways, I confirmed that the warnings do error with the new [lints] section for Cargo.toml, so this should be fixed when Rustc 1.74 releases. I'll probably open a new draft PR for that, just to have a reminder to merge the changes at that time. In the meantime, let's just ensure we check the actions for any warnings before merging any PR.

[github-actions]

Test262 conformance changes

Test result	main count	PR count	difference
Total	95,574	95,574	0
Passed	75,201	75,201	0
Ignored	19,482	19,482	0
Failed	891	891	0
Panics	0	0	0
Conformance	78.68%	78.68%	0.00%

[codecov]

Codecov Report

Attention: 54 lines in your changes are missing coverage. Please review.

Comparison is base (e54609e) 49.42% compared to head (9ad8b1f) 49.41%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3333      +/-   ##
==========================================
- Coverage   49.42%   49.41%   -0.02%     
==========================================
  Files         445      445              
  Lines       43891    43898       +7     
==========================================
- Hits        21691    21690       -1     
- Misses      22200    22208       +8     

Files	Coverage Δ
boa_cli/src/main.rs	0.61% <ø> (ø)
boa_engine/src/vm/mod.rs	61.42% <ø> (ø)
boa_engine/src/vm/opcode/mod.rs	5.32% <ø> (ø)
boa_runtime/src/console/mod.rs	41.93% <ø> (ø)
boa_examples/src/bin/commuter_visitor.rs	0.00% <0.00%> (ø)
boa_examples/src/bin/symbol_visitor.rs	0.00% <0.00%> (ø)
boa_examples/src/bin/modules.rs	0.00% <0.00%> (ø)
boa_examples/src/bin/runtime_limits.rs	0.00% <0.00%> (ø)
boa_examples/src/bin/loadfile.rs	0.00% <0.00%> (ø)
boa_examples/src/bin/jsdate.rs	0.00% <0.00%> (ø)
... and 1 more

... and 1 file with indirect coverage changes

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[HalidOdat]

Looks good to me! :)