refactor: all admin endpoints are now exposed under /admin/ on the …

[aeneasr]

…admin port

BREAKING CHANGE: All endpoints at the Admin API are now exposed at /admin/. For example, endpoint https://kratos:4434/identities is now exposed at https://kratos:4434/admin/identities. This change makes it easier to configure reverse proxies and API Gateways. Additionally, it introduces 1:1 compatibility between Ory Cloud's APIs and self-hosted Ory Kratos. Please note that nothing has changed in terms of the port. To make the migration less painful, we have set up redirects from the old endpoints to the new /admin endpoints, so your APIs, SDKs, and clients should continue working as they were working before. This change is marked as a breaking change as it touches many endpoints and might be confusing when encountering the redirect for the first time.

Related issue(s)

Checklist

• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
• I have read the security policy.
• I confirm that this pull request does not address a security
  vulnerability. If this pull request addresses a security. vulnerability, I
  confirm that I got green light (please contact
  security@ory.sh) from the maintainers to push
  the changes.
• I have added tests that prove my fix is effective or that my feature
  works.
• I have added or changed the documentation.

Further Comments

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@c7682a8). Click here to learn what that means.
The diff coverage is 73.49%.

❗ Current head 34084af differs from pull request most recent head 453b649. Consider uploading reports for the commit 453b649 to get more accurate results

@@            Coverage Diff            @@
##             master    #2292   +/-   ##
=========================================
  Coverage          ?   76.59%           
=========================================
  Files             ?      318           
  Lines             ?    17134           
  Branches          ?        0           
=========================================
  Hits              ?    13124           
  Misses            ?     3080           
  Partials          ?      930           

Impacted Files	Coverage Δ
selfservice/strategy/link/strategy_recovery.go	63.17% <ø> (ø)
session/handler.go	70.06% <ø> (ø)
x/nocache.go	40.00% <10.00%> (ø)
x/router.go	68.18% <62.85%> (ø)
cmd/daemon/serve.go	82.95% <100.00%> (ø)
driver/config/handler.go	100.00% <100.00%> (ø)
driver/registry_default.go	86.80% <100.00%> (ø)
identity/handler.go	85.71% <100.00%> (ø)
internal/testhelpers/server.go	90.47% <100.00%> (ø)
schema/handler.go	82.27% <100.00%> (ø)
... and 2 more

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