chore: move to paths relative to monorepo root for new monorepo support

[nickytonline]

Description

Brings the project in line with the improved monorepo support. I'm off next week and there are some incoming changes to the CLI for this. As well, we need to modify the Next.js runtime to take into account the new PACKAGE_PATH constant so that we can build the functions in the package folder and not the monorepo root, (see the work @eduardoboucas has done in #2260) e.g.

-  await writeFile(join(functionsPath, ODB_FUNCTION_NAME, 'pages.js'), jsSource)
-  await writeFile(join(functionsPath, HANDLER_FUNCTION_NAME, 'pages.js'), jsSource)
+  await writeFile(join(PACKAGE_PATH, functionsPath, ODB_FUNCTION_NAME, 'pages.js'), jsSource)
+  await writeFile(join(PACKAGE_PATH, functionsPath, HANDLER_FUNCTION_NAME, 'pages.js'), jsSource)

Aside from the configuration changes, the demo sites need to be reconfigured in the Netlify UI so that the base path is / instead of e.g. demos/default.

There are also E2E tests that run the Next.js E2E test suite that use the Netlify CLI, but the sites generated are not monorepo packages being created via the CLI, so those should not require and changes.

Note that all the demo sites in this PR will fail to build until the base paths are updated in the Netlify UI.

@pieh might take this over next week, but if not, I'll resume this work when I'm back.

Tests

All the demo sites should deploy as usual with the updated configurations and all checks are green.

Relevant links (GitHub issues, etc.) or a picture of cute animal

• Closes Modify demo site configurations to enable improved monorepo support on Netlify #2258
• Relates to feat: support new monorepo setup #2260, fix: use packagePath to compute internal functions directories netlify/cli#5944
• Introducing the Enhanced Monorepo Experience on Netlify

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[nickytonline]

I need to update the base paths in the Netlify UI. For the time being, everything should fail.

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[lukasholzer]

You need to adapt the ignore command as well:

- ignore = "if [ $CACHED_COMMIT_REF == $COMMIT_REF ]; then (exit 1); else git diff --quiet $CACHED_COMMIT_REF $COMMIT_REF ../..; fi;"
+ ignore = "if [ $CACHED_COMMIT_REF == $COMMIT_REF ]; then (exit 1); else git diff --quiet $CACHED_COMMIT_REF $COMMIT_REF; fi;"

as it's run from the repo root there is no need to cd outside of the repo with ../..