[NET-10719] Fix cluster generation for jwt clusters for external jwt providers

[jm96441n]

Description

JWT clusters were previously not being created correctly, this adds the plumbing to handle this in the enterprise fork

Testing & Reproduction steps

Links

PR Checklist

• updated test coverage
• external facing docs updated
• appropriate backport labels added
• not a security concern

[hc-github-team-consul-core]

@jm96441n, a backport is missing for this PR [21604] for versions [1.15,1.18] please perform the backport manually and add the following snippet to your backport PR description:

<details>
	<summary> Overview of commits </summary>
		- <<backport commit 1>>
		- <<backport commit 2>>
		...
</details>

[hc-github-team-consul-core]

@jm96441n, a backport is missing for this PR [21604] for versions [1.15,1.18] please perform the backport manually and add the following snippet to your backport PR description:

<details>
	<summary> Overview of commits </summary>
		- <<backport commit 1>>
		- <<backport commit 2>>
		...
</details>

[hc-github-team-consul-core]

@jm96441n, a backport is missing for this PR [21604] for versions [1.15,1.18] please perform the backport manually and add the following snippet to your backport PR description:

<details>
	<summary> Overview of commits </summary>
		- <<backport commit 1>>
		- <<backport commit 2>>
		...
</details>

[hc-github-team-consul-core]

@jm96441n, a backport is missing for this PR [21604] for versions [1.15,1.18] please perform the backport manually and add the following snippet to your backport PR description:

<details>
	<summary> Overview of commits </summary>
		- <<backport commit 1>>
		- <<backport commit 2>>
		...
</details>

[hc-github-team-consul-core]

@jm96441n, a backport is missing for this PR [21604] for versions [1.15,1.18] please perform the backport manually and add the following snippet to your backport PR description:

<details>
	<summary> Overview of commits </summary>
		- <<backport commit 1>>
		- <<backport commit 2>>
		...
</details>

[hc-github-team-consul-core]

@jm96441n, a backport is missing for this PR [21604] for versions [1.15,1.18] please perform the backport manually and add the following snippet to your backport PR description:

<details>
	<summary> Overview of commits </summary>
		- <<backport commit 1>>
		- <<backport commit 2>>
		...
</details>