defend against variable declaration issue

### Description

Figure out how we can prevent https://github.com/ampproject/amphtml/issues/39381, https://github.com/ampproject/amphtml/issues/39380

the issue cropped itself up in our module build but is non an issue in our nomodule build (because of function scoping)

Look into https://eslint.org/docs/latest/rules/no-redeclare if we can use this lint rule to prevent the issue

also look into why our tests was not able to catch the issue

### Reproduction Steps

re introduce this renaming bug
https://github.com/ampproject/amphtml/commit/54c040015323502c18d65b31a03aec69b98dd0b3

### Relevant Logs

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### Browser(s) Affected

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### OS(s) Affected

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### Device(s) Affected

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### AMP Version Affected

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