Allow expressing `meta` and `env` blocks as map attributes as well.

`env` and `meta` should support arbitrary key and values, yet hcl2
restricts the keys to valid identifiers. For example, block attribute
identifiers may not contain dots, `.`, which frequently used in meta
fields, and sometimes in environment variable fields.

By adding attribute syntax support, we maintain backward compatibility and relax the block attribute key restrictions. This change attempts to parse `env`/`meta` both as an attribute and as a
block.

Additionally, the change allows better expressivity for env/meta blocks, using
functions and for expressions. For example, one can reuse a set of environment variables for
multiple tasks, using a local `common_envs` value:

```hcl
env = merge(local.common_envs, {"more_env_key", "..."})
```

Note that the map/attribute compatibility workaround is currently a pattern we recommend for driver config blocks: https://www.nomadproject.io/docs/job-specification/hcl2#blocks . :( Sadly, the document isn't accurate, as only `meta` appearing inside driver config was handled in 1.0.1.

Closes https://github.com/hashicorp/nomad/issues/9606

As pointed out by Nick Ethier, if a node was ineligible before
it went down, downness should be displayed, not ineligibility.

lint: Upgrade buf to 0.36.0, latest so far

Allow expressing `meta` and `env` blocks as map attributes as well.
`env` and `meta` should support arbitrary key and values, yet hcl2
restricts the keys to valid identifiers. For example, block attribute
identifiers may not contain dots, `.`, which frequently used in meta
fields, and sometimes in environment variable fields.

This change attempts to parse `env`/`meta` both as an attribute and as a
block.

This additionally allows better expressivity for env/meta blocks, using
functions. For example, one can reuse a set of environment variables for
multiple tasks, using a local common_envs value:

```hcl
env = merge(local.common_envs, {"more_env_key", "..."})
```

consul: upgrade consul/api to 1.8.1

Update alert-banner.js

update latest release version on website

post-release merge for 1.0.3

Version 1.0.3

Update hcl2 for patch to fix map interpolation in dynamic blocks

UI: Use server-sent error messages when applicable

When the error is actually a 403, an ACL error is appropriate, but when
it isn't, fallback on what the API returns.

Automatically detect ACL errors
Provide a generic error message as a fallback

UI: Topology info panel incorrect accounting bugs

modify exec driver test TestExecDriver_StartWaitStop in light of the fact that signaling sleep with SIGINT doesn't work if it's PID1

modify exec driver test TestExecDriver_DestroyKills all in light of the fact that PID namespacing means that the kernel does this now