fix(fuzz): align Cargo feature names with #[invariant_test] fn names

Crucible v0.2.0 dispatches an invariant by feature flag, and that flag
must match the `#[invariant_test] fn <name>(...)` identifier in main.rs
(jito_tipdist_ref convention). CI invokes:

  crucible run pyth_solana_receiver invariant_two_step_governance_atomic
  crucible run pyth_solana_receiver invariant_reclaim_rent_returns_to_write_authority

so rename the corresponding fuzz crate features from the abbreviated
class names to the full invariant-fn names, in all 6 fuzz fixture
Cargo.toml files (3 reference variants × 2 fuzz fixtures each):

  invariant_two_step_governance        -> invariant_two_step_governance_atomic
  invariant_reclaim_rent_conservation  -> invariant_reclaim_rent_returns_to_write_authority

First CI run failed at "Crucible run — two_step_governance CLEAN" with
`the package 'pyth_two_step_governance_fuzz' does not contain this
feature: invariant_two_step_governance_atomic` — surface bug, not a
re-architecture.

Author: michael-moffett

references/pyth_receiver_ref/fuzz/pyth_reclaim_rent_conservation/Cargo.toml

@@ -27,4 +27,4 @@ name = "invariant_test"
 path = "src/main.rs"
 
 [features]
-invariant_reclaim_rent_conservation = []
+invariant_reclaim_rent_returns_to_write_authority = []

references/pyth_receiver_ref/fuzz/pyth_two_step_governance/Cargo.toml

@@ -29,4 +29,4 @@ name = "invariant_test"
 path = "src/main.rs"
 
 [features]
-invariant_two_step_governance = []
+invariant_two_step_governance_atomic = []

references/pyth_receiver_ref_planted_reclaim_rent_conservation/fuzz/pyth_reclaim_rent_conservation/Cargo.toml

@@ -27,4 +27,4 @@ name = "invariant_test"
 path = "src/main.rs"
 
 [features]
-invariant_reclaim_rent_conservation = []
+invariant_reclaim_rent_returns_to_write_authority = []

references/pyth_receiver_ref_planted_reclaim_rent_conservation/fuzz/pyth_two_step_governance/Cargo.toml

@@ -29,4 +29,4 @@ name = "invariant_test"
 path = "src/main.rs"
 
 [features]
-invariant_two_step_governance = []
+invariant_two_step_governance_atomic = []

references/pyth_receiver_ref_planted_two_step_governance/fuzz/pyth_reclaim_rent_conservation/Cargo.toml

@@ -27,4 +27,4 @@ name = "invariant_test"
 path = "src/main.rs"
 
 [features]
-invariant_reclaim_rent_conservation = []
+invariant_reclaim_rent_returns_to_write_authority = []

references/pyth_receiver_ref_planted_two_step_governance/fuzz/pyth_two_step_governance/Cargo.toml

@@ -29,4 +29,4 @@ name = "invariant_test"
 path = "src/main.rs"
 
 [features]
-invariant_two_step_governance = []
+invariant_two_step_governance_atomic = []