test(contracts): add IServiceManager avs tests

- test all IServiceManager view functions
- update getOperatorRestakedStrategies to match
  ServiceManagerBase.getOperatorRestakedStrategies spec

contracts/.gas-snapshot

@@ -2,8 +2,14 @@ FeeOracleV1_Test:test_feeFor_succeeds() (gas: 38619)
 FeeOracleV1_Test:test_setFee_nonOwner_reverts() (gas: 20220)
 FeeOracleV1_Test:test_setFee_succeeds() (gas: 30824)
 FeeOracleV1_Test:test_setFee_zero_reverts() (gas: 20212)
+OmniAVS_admin_Test:test_avsDirectory_succeeds() (gas: 14980)
 OmniAVS_admin_Test:test_deregisterOperator_byOwner_succeeds() (gas: 334360)
 OmniAVS_admin_Test:test_deregisterOperator_whenPaused_reverts() (gas: 69783)
+OmniAVS_admin_Test:test_getOPeratorRestakedStrategies_notOperator_succeeds() (gas: 42527)
+OmniAVS_admin_Test:test_getOperatorRestakedStrategies_noStrategies_succeeds() (gas: 308794)
+OmniAVS_admin_Test:test_getOperatorRestakedStrategies_succeeds() (gas: 369484)
+OmniAVS_admin_Test:test_getRestakeableStrategies_noStrategies_succeeds() (gas: 26237)
+OmniAVS_admin_Test:test_getRestakeableStrategies_succeeds() (gas: 84514)
 OmniAVS_admin_Test:test_pause_byOwner_succeeds() (gas: 44775)
 OmniAVS_admin_Test:test_registerOperator_whenPaused_reverts() (gas: 70972)
 OmniAVS_admin_Test:test_setStrategyParams_duplicateStrategy_reverts() (gas: 37780)
@@ -22,7 +28,7 @@ OmniAVS_allowlist_Test:test_removeFromAllowlist_succeeds() (gas: 109388)
 OmniAVS_allowlist_Test:test_setEthStakeInbox_notOwner_reverts() (gas: 18010)
 OmniAVS_allowlist_Test:test_setEthStakeInbox_succeeds() (gas: 26728)
 OmniAVS_allowlist_Test:test_setEthStakeInbox_zeroAddress_reverts() (gas: 20449)
-OmniAVS_initialize_Test:test_initialize_defaultParams_succeeds() (gas: 2863545)
+OmniAVS_initialize_Test:test_initialize_defaultParams_succeeds() (gas: 2804599)
 OmniAVS_syncWithOmni_Test:test_depositBeaconEth_succeeds() (gas: 475174)
 OmniPortal_admin_Test:test_setFeeOracle_nonOwner_reverts() (gas: 20322)
 OmniPortal_admin_Test:test_setFeeOracle_succeeds() (gas: 31835)