Bump to crossplane v1.16 and enable MR metrics

[nolancon]

Description of your changes

Update Crossplnae to v1.16.0 and enable new metrics introduced in crossplane/crossplane-runtime#683.

I have:

• Run make reviewable to ensure this PR is ready for review.
• Run make ceph-chainsaw to validate these changes against Ceph. This step is not always necessary. However, for changes related to S3 calls it is sensible to validate against an actual Ceph cluster. Localstack is used in our CI Chainsaw suite for convenience and there can be disparity in S3 behaviours betwee it and Ceph. See docs/TESTING.md for information on how to run tests against a Ceph cluster.
• Added backport release-x.y labels to auto-backport this PR if necessary.

How has this code been tested

Manually test and view the newly exposed metrics

• Port forward Provider Ceph pod port 8080
  k -n crossplane-system port-forward <provider-ceph-pod-name> 8080:8080
• Curl to metrics endpoint
  curl -s http://localhost:8080/metrics

# HELP certwatcher_read_certificate_errors_total Total number of certificate read errors
# TYPE certwatcher_read_certificate_errors_total counter
certwatcher_read_certificate_errors_total 0
# HELP certwatcher_read_certificate_total Total number of certificate reads
# TYPE certwatcher_read_certificate_total counter
certwatcher_read_certificate_total 1
# HELP controller_runtime_active_workers Number of currently used workers per controller
# TYPE controller_runtime_active_workers gauge
controller_runtime_active_workers{controller="managed/bucket.provider-ceph.ceph.crossplane.io"} 0
controller_runtime_active_workers{controller="providerconfig"} 0
controller_runtime_active_workers{controller="providerconfig/providerconfig.ceph.crossplane.io"} 0
# HELP controller_runtime_max_concurrent_reconciles Maximum number of concurrent reconciles per controller
# TYPE controller_runtime_max_concurrent_reconciles gauge
controller_runtime_max_concurrent_reconciles{controller="managed/bucket.provider-ceph.ceph.crossplane.io"} 160
controller_runtime_max_concurrent_reconciles{controller="providerconfig"} 5
controller_runtime_max_concurrent_reconciles{controller="providerconfig/providerconfig.ceph.crossplane.io"} 160
# HELP controller_runtime_reconcile_errors_total Total number of reconciliation errors per controller
# TYPE controller_runtime_reconcile_errors_total counter
controller_runtime_reconcile_errors_total{controller="managed/bucket.provider-ceph.ceph.crossplane.io"} 0
controller_runtime_reconcile_errors_total{controller="providerconfig"} 0
controller_runtime_reconcile_errors_total{controller="providerconfig/providerconfig.ceph.crossplane.io"} 0
# HELP controller_runtime_reconcile_time_seconds Length of time per reconciliation per controller
# TYPE controller_runtime_reconcile_time_seconds histogram
controller_runtime_reconcile_time_seconds_bucket{controller="managed/bucket.provider-ceph.ceph.crossplane.io",le="0.005"} 0
controller_runtime_reconcile_time_seconds_bucket{controller="managed/bucket.provider-ceph.ceph.crossplane.io",le="0.01"} 15
controller_runtime_reconcile_time_seconds_bucket{controller="managed/bucket.provider-ceph.ceph.crossplane.io",le="0.025"} 16
controller_runtime_reconcile_time_seconds_bucket{controller="managed/bucket.provider-ceph.ceph.crossplane.io",le="0.05"} 16
controller_runtime_reconcile_time_seconds_bucket{controller="managed/bucket.provider-ceph.ceph.crossplane.io",le="0.1"} 16
controller_runtime_reconcile_time_seconds_bucket{controller="managed/bucket.provider-ceph.ceph.crossplane.io",le="0.15"} 16
controller_runtime_reconcile_time_seconds_bucket{controller="managed/bucket.provider-ceph.ceph.crossplane.io",le="0.2"} 16