[chore][exporter/doris] Fix lint on doris exporter

[mx-psi]

Description

Fix main that is failing because of linting issues.

This is due to a race condition between PRs #36912 and one of the recent PRs related to linters (the spelling one?). The error this fixes is

dorisexporter/exporter_common.go:127:6: var-naming: func toJsonLines should be toJSONLines (revive)
func toJsonLines[T dLog | dTrace | metric](data []*T) ([]byte, error) {
     ^

[mx-psi]

Closes in favor of #37177