This updates the github workflows to auto generate release notes.
Additionally it bumps softprops/action-gh-release to v2.

Upgrading pulumi/pkg and pulumi/sdk to version v3.124.0.

Upgrading pulumi/pkg and pulumi/sdk to version v3.125.0.

Upgrading pulumi/pkg and pulumi/sdk to version v3.127.0.

The case analysis around picking which allocator to use is made more
explicit and covered with a unit test.

Upgrading pulumi/pkg and pulumi/sdk to version v3.127.0.

The awsx.ec2.Vpc resource supports three subnet layout strategies: Auto,
Exact, and Legacy. Consider the following program that does not specify
the subnet specs:

    new awsx.ec2.Vpc("vpc", {
        subnetStrategy: "Auto",
    });

Prior to this change, the code would implicitly use the Legacy strategy
for this program even though Auto is requested. This is now fixed. The
Auto strategy already supports allocating subnets without any explicit
specs provided.

Routine dependency upgrade: upgrade AWS provider to v6.47.0.

Fixes #1347

This is to avoid the tests failing due to the token expiring.

Newly introduced IPAM-based tests are long running due to a known issue
with slow deletions of aws.ec2.Vpc, see
pulumi/pulumi-aws#4346

Fixes issues with supporting the ipv4IpamPoolId parameter that ties a
VPC to an IPAM pool.

You should now be able to write the following to allows IPAM to allocate
and manage a cidrBlock range. The VPC component now uses that
dynamically allocated block to automatically configure subnets.

```typescript
new awsx.ec2.Vpc("myVpc", {
  ipv4IpamPoolId: myVpcIpamPool.id,
  ipv4NetmaskLength: 24,
  subnetStrategy: "Auto",
});
```

It is also possible to constrain the allocated subnets with subnetSpecs,
while still using IPAM to manage the overall cidrBlock range:

```typescript
new awsx.ec2.Vpc("myVpc", {
  numberOfAvailabilityZones: 3,
  subnetStrategy: "Auto",
  ipv4IpamPoolId: myVpcIpamPool.id,
  ipv4NetmaskLength: 22,
  subnetSpecs: [
    {
      type: "Private",
      name: "private",
      cidrMask: 25,
    },
    {
      type: "Public",
      name: "public",
      cidrMask: 27,
    },
  ],
  tags: tags,
});
```

Fixes #872 

Note that `subnetStrategy: "Auto"` is required with this functionality,
and "Legacy" strategy is not supported.