[Gradle] Handle plugin version variables without string interpolation

[Flexicon]

Fixes #4127

This change allows direct variables in place of versions to be used in Gradle Plugins scope without the need to redundantly interpolate them in a string.

---

This PR addresses the following issue:

Does not work - versions are ignored by Dependabot:

plugins {
    val kotlinVersion = "1.7.0"
    kotlin("jvm") version kotlinVersion
    kotlin("plugin.spring") version kotlinVersion
}

Works as a workaround - versions are picked up correctly:

plugins {
    val kotlinVersion = "1.7.0"
    kotlin("jvm") version "$kotlinVersion"
    kotlin("plugin.spring") version "$kotlinVersion"
}

[Flexicon]

@brrygrdn any chance to get some eyes on this one? 🙏

[Flexicon]

Done @jeffwidman ✅

[jeffwidman]

Thanks! Looks like tests are still failing though?

Also, can you explain why the tests need the length changed? I assumed originally that was related to a regex change capturing an additional character which gets parsed out, but since it's no longer doing that, makes me realize I don't know why the length change is/isn't needed?

[Flexicon]

Yeah I see that, I'll take a look later and try and fix it. It's been a few months so my memory is a bit hazy.

I assumed originally that was related to a regex change capturing an additional character which gets parsed out

That was exactly the intention at the time. I'll have to dig in and check why it's not working anymore.

[Flexicon]

Hey @jeffwidman, finally had some time to look into it. Turns out I messed up on the rebase and had a question mark in the wrong place for the regex.

Should be good to go now 👌

[Flexicon]

@jeffwidman @bdragon any chance for another review 🙏🏻 The MR had to be updated with master again.

[jeffwidman]

Sorry @Flexicon I was offline the past few days. Looks like @Nishnha has you covered though!