RFR: Disable failing tests while fixes are in progress

[Y. Srinivas Ramakrishna]

On Fri, 14 Apr 2023 22:10:55 GMT, William Kemper <wkemper at openjdk.org> wrote:

> These tests related to the `borrow-from-old` and `generation-resizing-v1` features are being disabled while improvements are made.

Marked as reviewed by ysr (Author).

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PR Review: https://git.openjdk.org/shenandoah/pull/259#pullrequestreview-1386249967