Remove pallet::getter usage from all pallet-tips (#4871)

### ISSUE
Link to the issue:
https://github.com/paritytech/polkadot-sdk/issues/3326
cc @muraca 

Deliverables
 - [Deprecation] remove pallet::getter usage from all pallet-tips
 

### Test Outcomes
___
Successful tests by running `cargo test -p pallet-tips --features
runtime-benchmarks`



running 26 tests
test tests::__construct_runtime_integrity_test::runtime_integrity_tests
... ok
test benchmarking::bench_retract_tip ... ok
test tests::equal_entries_invariant ... ok
test benchmarking::bench_tip ... ok
test tests::finders_fee_invariant ... ok
test tests::genesis_config_works ... ok
test tests::genesis_funding_works ... ok
test benchmarking::bench_slash_tip ... ok
test tests::reasons_invariant ... ok
test benchmarking::bench_report_awesome ... ok
test tests::close_tip_works ... ok
test tests::report_awesome_from_beneficiary_and_tip_works ... ok
test tests::test_genesis_config_builds ... ok
test tests::test_last_reward_migration ... ok
test benchmarking::bench_tip_new ... ok
test benchmarking::bench_close_tip ... ok
test tests::test_migration_v4 ... ok
test tests::slash_tip_works ... ok
test tests::report_awesome_and_tip_works_second_instance ... ok
test tests::report_awesome_and_tip_works ... ok
test tests::tip_changing_works ... ok
test tests::zero_base_deposit_prohibited - should panic ... ok
test tests::tip_median_calculation_works ... ok
test tests::tip_new_cannot_be_used_twice ... ok
test tests::tip_large_should_fail ... ok
test tests::retract_tip_works ... ok

test result: ok. 26 passed; 0 failed; 0 ignored; 0 measured; 0 filtered
out; finished in 0.02s

   Doc-tests pallet_tips

running 0 tests

test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered
out; finished in 0.00s

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Co-authored-by: Bastian Köcher <[email protected]>