Automatic merge from submit-queue (batch tested with PRs 49651, 49707, 49662, 47019, 49747)

Add support for `no_new_privs` via AllowPrivilegeEscalation

**What this PR does / why we need it**:
Implements kubernetes/community#639
Fixes #38417

Adds `AllowPrivilegeEscalation` and `DefaultAllowPrivilegeEscalation` to `PodSecurityPolicy`.
Adds `AllowPrivilegeEscalation` to container `SecurityContext`.

Adds the proposed behavior to `kuberuntime`, `dockershim`, and `rkt`. Adds a bunch of unit tests to ensure the desired default behavior and that when `DefaultAllowPrivilegeEscalation` is explicitly set.

Tests pass locally with docker and rkt runtimes. There are also a few integration tests with a `setuid` binary for sanity.

**Release note**:

```release-note
Adds AllowPrivilegeEscalation to control whether a process can gain more privileges than it's parent process
```