Extract constant for "approximately everything" page size

[david-crespo]

Currently 1000.

$ rg 'limit: 1000'
app/api/window.ts
61:      const result = await api.methods.timeseriesSchemaList({ query: { limit: 1000 } })

app/pages/system/silos/SiloIpPoolsTab.tsx
65:    query: { limit: 1000 },
201:    query: { limit: 1000 },
203:  const allPools = useApiQuery('ipPoolList', { query: { limit: 1000 } })

app/pages/system/networking/IpPoolPage.tsx
374:    query: { limit: 1000 },
376:  const allSilos = useApiQuery('siloList', { query: { limit: 1000 } })

app/forms/firewall-rules-create.tsx
60:    apiQueryClient.prefetchQuery('instanceList', { query: { project, limit: 1000 } }),
61:    apiQueryClient.prefetchQuery('vpcList', { query: { project, limit: 1000 } }),

app/forms/disk-attach.tsx
40:  const { data } = useApiQuery('diskList', { query: { project, limit: 1000 } })
...