Exchanges: Remove bespoke pair upgrade handling and abstract Start/Run (#1424)

* Exchanges: Remove Pair upgrade handling

Now redundant behind #1401. These paths should never be met.

Several legacy coin upgrade paths being deprecated as well: ZUSD and CNY
Expecting any users with bad config from 3+ years ago would have to
reset anyway.

Also: At the time the intention of this was to upgrade the config
format.
However now, instead, it'd mostly serve to reset enabled pairs if
there's a config mistake, which doesn't feel right.

* Kraken: Fix typo in Kraken type struct

* Exchanges: Abstract exchange Start() and Run()

* Exchanges: Add test for abstracted Start

* Exchanges: Move Start to Bootstrap

* Simplify waitgroup usage
* Add call to exchange.Bootstrap to allow overide or supplementation

* Exchanges: Concurrent common bootstap actions

* Gateio: Remove incorrect Run in test

* GateIO: Fix pair dependencies in tests

This ensures that the pairs are initialised no more than needed and
kind-of just-in-time.
Better pattern might be to use a function to get these pairs when we
need them.

* Exchanges: Complete UpdatePairs before ExecLims

If we're going to update pairs, it needs to complete before we check for
limits to avoid errors on old pairs

* Exchanges: Remove Start and Run from tmpl

Since they're replaced by bootstrap now and shouldn't need customisation
normally

* Alphapoint: Move Start to Bootstrap

* GateIO: Fix linter shadow var

exchanges/gateio/gateio_wrapper.go

@@ -8,7 +8,6 @@ import (
 	"sort"
 	"strconv"
 	"strings"
-	"sync"
 	"time"
 
 	"github.com/shopspring/decimal"
@@ -244,33 +243,6 @@ func (g *Gateio) Setup(exch *config.Exchange) error {
 	})
 }
 
-// Start starts the GateIO go routine
-func (g *Gateio) Start(ctx context.Context, wg *sync.WaitGroup) error {
-	if wg == nil {
-		return fmt.Errorf("%T %w", wg, common.ErrNilPointer)
-	}
-	wg.Add(1)
-	go func() {
-		g.Run(ctx)
-		wg.Done()
-	}()
-	return nil
-}
-
-// Run implements the GateIO wrapper
-func (g *Gateio) Run(ctx context.Context) {
-	if g.Verbose {
-		g.PrintEnabledPairs()
-	}
-	if !g.GetEnabledFeatures().AutoPairUpdates {
-		return
-	}
-	err := g.UpdateTradablePairs(ctx, false)
-	if err != nil {
-		log.Errorf(log.ExchangeSys, "%s failed to update tradable pairs. Err: %s", g.Name, err)
-	}
-}
-
 // UpdateTicker updates and returns the ticker for a currency pair
 func (g *Gateio) UpdateTicker(ctx context.Context, p currency.Pair, a asset.Item) (*ticker.Price, error) {
 	if !g.SupportsAsset(a) {