[Bug] Removing inner TaskExecutor to call DMI

[Bug] Removing inner TaskExecutor to call DMI

- Removing TaskExecutor from cps-ncmp-service package as anyways the
  call coming over from the cps-ncmp-rest layer is managed by a
  different thread executor(CpsNcmpTaskExecutor)
- Provided 60secs timeout value.
- Spawning new thread from a different executor might not be needed
- Removing @Async from a non spring managed method as its of no use

Issue-ID: CPS-2150
Change-Id: Ic99632983aff2c40df81421d782cf98ec600fc41
Signed-off-by: mpriyank <priyank.maheshwari@est.tech>