RFR: 1670: Make body handling consistent in all Issue implementations

[Erik Joelsson]

On Wed, 9 Nov 2022 19:06:40 GMT, Zhao Song <zsong at openjdk.org> wrote:

> When fixing [SKARA-1658](https://bugs.openjdk.org/browse/SKARA-1658), I found the `TestIssue#body` didn't mimic `GitHubPullRequest#body` and` GitLabMergeRequest#body` properly. So this will block SKARA-1658.
> 
> The `body()` method in `TestIssue` always returns the latest body from the 'remote' instead of the cache. So it behaves different from GitHubPullRequest and GitLabMergeRequest.
> 
> In this patch, `TestIssue#body` will return the cached body like `GitHubPullRequest#body` and `GitLabMergeRequest#body`. Also updated related tests.

Good that you made this a separate change and good catch.

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Marked as reviewed by erikj (Lead).

PR: https://git.openjdk.org/skara/pull/1417