EntityTokens - Allow using mocked data

EntityTokens - Allow using mocked data

Before: EntityTokens reads `$tokenContext['contributionId']` and fetches the corresponding `civicrm_contribution`. The
data must exist in that record.

After: EntityTokens reads both `$tokenContext['contributionId']` and `$tokenContext['contribution']`. Data in
`$tokenContext['contribution']` takes precedence, rendering the content of `civicrm_contribution` mute.