fix(frontend): first time choosing a pipeline definition is VERY slow. Fixes #10897

[ElayAharoni]

Fixes #10897.
i found that whenever a V2 pipeline is chosen for a new run, then there is a check whether v1Template is fetching and because it is not a v1 pipeline then the message is seen for long time.

so basically what i did is check whether the v1 template is fetching only when the pipeline is v1 and not v2, which cause in significant reduce in the loading time.

[google-oss-prow]

Hi @ElayAharoni. Thanks for your PR.

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[ElayAharoni]

/ok-to-test
/rerun-all

[google-oss-prow]

@ElayAharoni: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/ok-to-test
/rerun-all

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[hbelmiro]

/ok-to-test
/rerun-all

[ElayAharoni]

please review when you get the chance.
@HumairAK , @zijianjoy

[chensun]

/lgtm
/approve

[google-oss-prow]

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