feat: allow skipping of middleware handling

[ascorbic]

Summary

We currently change behaviour in several places if we detect middleware, such as adding extra rewrites and skipping moving of files ot the CDN. This PR adds an env var that allows this to be skipped.

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

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[cypress]

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Test summary

2 • 0 • 0 • 0

---

Run details

Project	netlify-plugin-nextjs-nx-monorepo-demo
Status	Passed
Commit	9a57782 ℹ️
Started	Mar 23, 2022 12:05 PM
Ended	Mar 23, 2022 12:06 PM
Duration	01:08 💡
OS	Linux Ubuntu - 20.04
Browser	Chrome 98

View run in Cypress Dashboard ➡️

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This comment has been generated by cypress-bot as a result of this project's GitHub integration settings. You can manage this integration in this project's settings in the Cypress Dashboard

[cypress]

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Test summary

7 • 0 • 0 • 0

---

Run details

Project	netlify-plugin-nextjs-static-demo
Status	Passed
Commit	9a57782 ℹ️
Started	Mar 23, 2022 12:05 PM
Ended	Mar 23, 2022 12:06 PM
Duration	01:12 💡
OS	Linux Ubuntu - 20.04
Browser	Chrome 98

View run in Cypress Dashboard ➡️

---

This comment has been generated by cypress-bot as a result of this project's GitHub integration settings. You can manage this integration in this project's settings in the Cypress Dashboard

[cypress]

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Test summary

22 • 0 • 0 • 0

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Run details

Project	netlify-plugin-nextjs-default-demo
Status	Passed
Commit	9a57782 ℹ️
Started	Mar 23, 2022 12:05 PM
Ended	Mar 23, 2022 12:06 PM
Duration	01:31 💡
OS	Linux Ubuntu - 20.04
Browser	Chrome 98

View run in Cypress Dashboard ➡️

---

This comment has been generated by cypress-bot as a result of this project's GitHub integration settings. You can manage this integration in this project's settings in the Cypress Dashboard

[krider2010]

[krider2010]

Now ship it? 😉