fix(CI): free-up disk, properly gate nightly feature and pre-install deps (#3735)

* fix(CI): pre-install tailwind and sass

* chore: retrigger CI

* fix(CI): properly set `erased_mode` in examples

* fix(CI): workflow logic install deps locally

* chore(CI): organized tailwind and sass versions

* fix: properly ignore nightly features on stable rustc

* fix(CI): typo

* fix: missing cfg attr

* fix: properly gate nightly module in `reactive_graph``

* fix: complete `rustc_nightly` cfg gate

* fix(CI): making even more space for CI workers

* fix: missing one more rustc_nightly gated feature

* fix: maximize the speed of cargo-all-features by limiting combinations to 2

integrations/actix/Cargo.toml

@@ -39,3 +39,4 @@ tracing = ["dep:tracing"]
 
 [package.metadata.cargo-all-features]
 denylist = ["tracing"]
+max_combination_size = 2

integrations/axum/Cargo.toml

@@ -51,3 +51,4 @@ rustdoc-args = ["--generate-link-to-definition"]
 
 [package.metadata.cargo-all-features]
 denylist = ["tracing"]
+max_combination_size = 2