misc: 🟢 address warnings from galileo build

[cratelyn]

💭 describe your changes

when galileo is built against the current contents of main, these warnings appear:

warning: method `init` is never used
  --> /penumbra/crates/core/component/shielded-pool/src/component/fmd.rs:79:8
   |
78 | pub(crate) trait ClueManagerInternal: ClueManager {
   |                  ------------------- method in this trait
79 |     fn init(&mut self) {
   |        ^^^^
   |
   = note: `#[warn(dead_code)]` on by default

warning: `penumbra-shielded-pool` (lib) generated 1 warning
warning: method `get_position_count` is never used
  --> /penumbra/crates/core/component/dex/src/component/position_manager/counter.rs:14:14
   |
11 | pub(super) trait PositionCounterRead: StateRead {
   |                  ------------------- method in this trait
...
14 |     async fn get_position_count(&self, trading_pair: &TradingPair) -> u32 {
   |              ^^^^^^^^^^^^^^^^^^
   |
   = note: `#[warn(dead_code)]` on by default

warning: `penumbra-dex` (lib) generated 1 warning
warning: method `stream_dutch_state_by_trigger` is never used
   --> /penumbra/crates/core/component/auction/src/component/dutch_auction.rs:462:14
    |
444 | pub(crate) trait DutchAuctionData: StateRead {
    |                  ---------------- method in this trait
...
462 |     async fn stream_dutch_state_by_trigger(
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `#[warn(dead_code)]` on by default

warning: `penumbra-auction` (lib) generated 1 warning
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.12s
[Finished running. Exit status: 0]

this addresses those warnings.

✅ checklist before requesting a review

• if this code contains consensus-breaking changes, i have added the
  "consensus-breaking" label. otherwise, i declare my belief that there are not
  consensus-breaking changes, for the following reason:

  this only removes dead code.

[cratelyn]

CI is no longer passing after a rebase (???) so i'm going to mark this as a draft. there's some unfortunate interaction with cargo features here.

[cratelyn]

okay neato, ci is green again 🙌