Replaces MockInvokeContext by ThisInvokeContext in tests (#20881)

* Replaces MockInvokeContext by ThisInvokeContext in BpfLoader, SystemInstructionProcessor, CLIs, ConfigProcessor, StakeProcessor and VoteProcessor.

* Finally, removes MockInvokeContext, MockComputeMeter and MockLogger.

* Adjusts assert_instruction_count test.

* Moves ThisInvokeContext to the program-runtime crate.

core/src/cost_update_service.rs

@@ -204,7 +204,7 @@ impl CostUpdateService {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use solana_program_runtime::ProgramTiming;
+    use solana_program_runtime::instruction_processor::ProgramTiming;
     use solana_sdk::pubkey::Pubkey;
 
     #[test]