Fix browser frame management for amp-story

### Description

Stories has been running into multiple story page navigation issues recently which was first reported in https://github.com/ampproject/amphtml/issues/38531. We have implemented quick workarounds as of now since a proper fix will take a bit of time to refactor the frame management code.

link to workaround https://github.com/ampproject/amphtml/pull/38576.

### Reproduction Steps

https://github.com/ampproject/amphtml/issues/38531

### Relevant Logs

_No response_

### Browser(s) Affected

_No response_

### OS(s) Affected

_No response_

### Device(s) Affected

_No response_

### AMP Version Affected

_No response_

Start with the navigation problem described in issue 38531 and compare it with the workaround in pull request 38576. Then inspect the amp-story frame management code and reproduce the reported story page navigation issue. Done means the underlying frame management is corrected rather than relying on the workaround.

Written by the indexing model from the issue text.