GODT-1356 GODT-1302: Cache on disk concurency and API retries

- GODT-1302: Change maximum resty retries from 0 to 30
- GODT-1302: Make sure we are closing GetAttachmen io.ReadCloser on error
- GODT-1356: Do not use attachmentPool - it was useless anyway
- GODT-1356: Increase cache watcher limit to 10min
- GODT-1356: Start cache watcher right after start (do not wait first 10 min)
- GODT-1356: Limit number of buildJobs (memory allocation) in BuildAndCacheMessage
- Other: Pass context from job options (message builder) to fetcher (both message and attachments)
- Other: BuildJob contains same function as returned buildDone (proper map locking)

pkg/pmapi/client.go

@@ -84,7 +84,7 @@ func (c *client) r(ctx context.Context) (*resty.Request, error) {
 	return r, nil
 }
 
-// do executes fn and may repeate it in case "401 Unauthorized" error is returned.
+// do executes fn and may repeat execution in case of retry after "401 Unauthorized" error.
 // Note: fn may be called more than once.
 func (c *client) do(ctx context.Context, fn func(*resty.Request) (*resty.Response, error)) (*resty.Response, error) {
 	r, err := c.r(ctx)