Fix minimumCacheTTL so it doesn't affect browser caching

[styfle]

In a previous PR (#27200), we added minimumCacheTTL to configure the time-to-live for the cached image. However, this was setting the max-age header.

This PR ensures that minimumCacheTTL doesn't affect browser caching, only the upstream header can affect browser caching.

This is a bit safer in case the developer accidentally caches something that shouldn't be and the cache needs to be invalidated. Simply delete the .next/cache/images directory.

• Related to Custom Cache-Control response header for /_next/image #19914
• Related to Cache-Control headers set in next.config.js are overwritten #22319

[ijjk]

Failing test suites

Commit: de16391

test/integration/config-devtool-dev/test/index.test.js

• devtool set in development mode in next config > should warn and revert when a devtool is set in development mode

Expand output

● devtool set in development mode in next config › should warn and revert when a devtool is set in development mode

thrown: "Exceeded timeout of 30000 ms for a test.
Use jest.setTimeout(newTimeout) to increase the timeout value, if this is a long-running test."

  17 |
  18 | describe('devtool set in development mode in next config', () => {
> 19 |   it('should warn and revert when a devtool is set in development mode', async () => {
     |   ^
  20 |     let stderr = ''
  21 |
  22 |     const appPort = await findPort()

  at integration/config-devtool-dev/test/index.test.js:19:3
  at Object.<anonymous> (integration/config-devtool-dev/test/index.test.js:18:1)

[ijjk]

Looks good!

[ijjk]

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	vercel/next.js canary	vercel/next.js adjust-max-age-browser	Change
buildDuration	15.3s	15.5s	⚠️ +207ms
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nodeModulesSize	49.5 MB	49.5 MB	-231 B

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	vercel/next.js canary	vercel/next.js adjust-max-age-browser	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.434	2.464	⚠️ +0.03
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withRouter.html gzip	524 B	524 B	✓
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---

Webpack 4 Mode (Decrease detected ✓)

General Overall decrease ✓

	vercel/next.js canary	vercel/next.js adjust-max-age-browser	Change
buildDuration	12.3s	12.3s	-27ms
buildDurationCached	4.9s	4.7s	-152ms
nodeModulesSize	49.5 MB	49.5 MB	-231 B

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	vercel/next.js adjust-max-age-browser	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.467	2.524	⚠️ +0.06
/ avg req/sec	1013.57	990.32	⚠️ -23.25
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.346	1.38	⚠️ +0.03
/error-in-render avg req/sec	1857.07	1810.99	⚠️ -46.08

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677f882d2ed8..HASH.js gzip	13.7 kB	13.7 kB	✓
framework.HASH.js gzip	41.9 kB	41.9 kB	✓
main-HASH.js gzip	8.4 kB	8.4 kB	✓
webpack-HASH.js gzip	1.22 kB	1.22 kB	✓
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_error-HASH.js gzip	3.76 kB	3.76 kB	✓
amp-HASH.js gzip	552 B	552 B	✓
css-HASH.js gzip	333 B	333 B	✓
dynamic-HASH.js gzip	2.71 kB	2.71 kB	✓
head-HASH.js gzip	2.97 kB	2.97 kB	✓
hooks-HASH.js gzip	911 B	911 B	✓
index-HASH.js gzip	231 B	231 B	✓
link-HASH.js gzip	1.64 kB	1.64 kB	✓
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script-HASH.js gzip	3.02 kB	3.02 kB	✓
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index.html gzip	577 B	577 B	✓
link.html gzip	588 B	588 B	✓
withRouter.html gzip	569 B	569 B	✓
Overall change	1.73 kB	1.73 kB	✓

Commit: ad31ea3