Make number of pinned_timestamp files to keep in remote configurable.

[sachinpkale]

Is your feature request related to a problem? Please describe

Currently, we keep last 5 pinned_timestamps files in remote store. It is possible that a data node scheduler which is reading the file, the read was delayed due to some issue and at the same time the file is being deleted.

To avoid this, we need a lease mechanism which will prevent the deletion of pinned timestamp file while being read. A short term solution would be to make this value configurable.

Describe the solution you'd like

Reference: #15180 (comment)

Related component

Storage:Remote

Describe alternatives you've considered

No response

Additional context

No response

[sachinpkale]

Not required anymore as we will be storing 1 empty file per pinned timestamp (#15526)