[Gatsby-Plugin] GastsbyJS merge of add option for openTracingConfigFile env: ETA OCT

[jpvajda]

From Gatsby > the tracing issue will be worked on during the next sprint which starts on Aug. 16.
Discussion: gatsbyjs/gatsby#32734
PR: gatsbyjs/gatsby#32513

AC

• confirm when this PR is merged as it's a change we intend to leverage in our plugin experimental changes.
  Once merged in we can include this on our plugin functionality