refactor multiple publish-percentiles configuration to only one configuration.

[nparaddi-walmart]

As part of the PR 1689, I have added five publish-percentiles configuration, This PR changes all those five to only one configuration.

Motivation: There are too many configurations for client SDK users to configure. Now I am think i added too many configurations and thought of changing to only one configuration.

Modifications: change five publish-percentiles configuration to only one configuration.

Describe the modifications you've done. Do appropriate changes in code to use only one publish-percentiles configuration.

Result: We can control all the histogram metrics publish-percentiles through only configuration. We cannot have seprate percentiles for different histogram metrics.