[Service] refactor: TargetNumRelays var usage to param usage

[bryanchriswhite]

Summary

Replace usage of servicekeeper.TargetNumRelays with the new param and delete it.

Issue

• TODO_BETA

Type of change

Select one or more from the following:

• New feature, functionality or library
• Consensus breaking; add the consensus-breaking label if so. See [Infra] Automatically add the consensus-breaking label #791 for details
• Bug fix
• Code health or cleanup
• Documentation
• Other (specify)

Testing

• Documentation: make docusaurus_start; only needed if you make doc changes
• Unit Tests: make go_develop_and_test
• LocalNet E2E Tests: make test_e2e
• DevNet E2E Tests: Add the devnet-test-e2e label to the PR.

Sanity Checklist

• I have tested my changes using the available tooling
• I have commented my code
• I have performed a self-review of my own code; both comments & source code
• I create and reference any new tickets, if applicable
• I have left TODOs throughout the codebase, if applicable

[github-actions]

The CI will now also run the e2e tests on devnet, which increases the time it takes to complete all CI checks.

You may need to run make trigger_ci to submit an empty commit that'll trigger the tests.

GCP workloads (requires changing the namespace to 943)
Grafana network dashboard for devnet-issue-943

[bryanchriswhite]

Not sure if we need to make this change:

https://discord.com/channels/824324475256438814/1138895490331705354/1307077093351362621

Suggested change

	numRelays,
	targetNumRelays,

(cc @red-0ne )

[bryanchriswhite]

This change causes some test failures:

=== RUN   TestComputeNewDifficultyHash_MonotonicallyIncreasingRelays
    update_relay_mining_difficulty_test.go:45: Relay Mining Increasing Difficult Debug. NumRelays: 1000, EMA: 90099, TargetHash: ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
    update_relay_mining_difficulty_test.go:34: 
        	Error Trace:	/home/bwhite/Projects/pokt/poktroll/x/service/keeper/update_relay_mining_difficulty_test.go:34
        	Error:      	"10000" is not greater than "90099"
        	Test:       	TestComputeNewDifficultyHash_MonotonicallyIncreasingRelays
--- FAIL: TestComputeNewDifficultyHash_MonotonicallyIncreasingRelays (0.00s)

=== RUN   TestUpdateRelayMiningDifficulty_Base
    update_relay_mining_difficulty_test.go:105: 
        	Error Trace:	/home/bwhite/Projects/pokt/poktroll/x/service/keeper/update_relay_mining_difficulty_test.go:105
        	Error:      	Not equal: 
        	            	expected: 0x3e8
        	            	actual  : 0x15ff3
        	Test:       	TestUpdateRelayMiningDifficulty_Base
--- FAIL: TestUpdateRelayMiningDifficulty_Base (0.00s)

Expected :0x3e8
Actual   :0x15ff3

=== RUN   TestUpdateRelayMiningDifficulty_FirstDifficulty/First_Difficulty_way_below_target
    update_relay_mining_difficulty_test.go:217: 
        	Error Trace:	/home/bwhite/Projects/pokt/poktroll/x/service/keeper/update_relay_mining_difficulty_test.go:217
        	Error:      	Not equal: 
        	            	expected: 0x64
        	            	actual  : 0x15f99
        	Test:       	TestUpdateRelayMiningDifficulty_FirstDifficulty/First_Difficulty_way_below_target
--- FAIL: TestUpdateRelayMiningDifficulty_FirstDifficulty/First_Difficulty_way_below_target (0.00s)

Expected :0x64
Actual   :0x15f99

=== RUN   TestUpdateRelayMiningDifficulty_FirstDifficulty/First_Difficulty_way_above_target
    update_relay_mining_difficulty_test.go:217: 
        	Error Trace:	/home/bwhite/Projects/pokt/poktroll/x/service/keeper/update_relay_mining_difficulty_test.go:217
        	Error:      	Not equal: 
        	            	expected: 0x5f5e100
        	            	actual  : 0x99f610
        	Test:       	TestUpdateRelayMiningDifficulty_FirstDifficulty/First_Difficulty_way_above_target
--- FAIL: TestUpdateRelayMiningDifficulty_FirstDifficulty/First_Difficulty_way_above_target (0.00s)

Expected :0x5f5e100
Actual   :0x99f610