Avoid initial NetworkStatus.poll for watched queries.

In commit 6e0135d (part of PR apollographql#5565) I
added a this.queryStore.initQuery call to the QueryManager#watchQuery
method, to ensure the queryStore has information about watched queries as
early as possible. However, I mistakenly copied the isPoll option value
from the initQuery call site in fetchQuery, which caused some watched
queries (those that use polling) to have NetworkStatus.poll instead of
NetworkStatus.loading before any network activity had occurred. This
commit fixes that problem by always passing isPoll:false in watchQuery,
regardless of whether options.pollInterval is defined.

src/core/QueryManager.ts

@@ -776,7 +776,11 @@ export class QueryManager<TStore> {
       document: this.transform(options.query).document,
       variables: options.variables,
       storePreviousVariables: false,
-      isPoll: typeof options.pollInterval === 'number',
+      // Even if options.pollInterval is a number, we have not started
+      // polling this query yet (and we have not yet performed the first
+      // fetch), so NetworkStatus.loading (not NetworkStatus.poll or
+      // NetworkStatus.refetch) is the appropriate status for now.
+      isPoll: false,
       isRefetch: false,
       metadata: options.metadata,
       fetchMoreForQueryId: void 0,