refactor: support backwards compatibility with environment names and …

…related CLI flags (#680)

1. When in Legacy environment mode we should not compute name field if specified in an environment.
2. Throw an Error when `--env` and `--name` are used together in Legacy Environment, except for Secrets & Tail which are using a special case `getLegacyScriptName` for parity with Wrangler1
3. Started the refactor for args being utilized at the Config level, currently checking for Legacy Environment only.

Fixes #672

.changeset/swift-apes-battle.md

@@ -0,0 +1,11 @@
+---
+"wrangler": patch
+---
+
+refactor: support backwards compatibility with environment names and related CLI flags
+
+1. When in Legacy environment mode we should not compute name field if specified in an environment.
+2. Throw an Error when `--env` and `--name` are used together in Legacy Environment, except for Secrets & Tail which are using a special case `getLegacyScriptName` for parity with Wrangler1
+3. Started the refactor for args being utilized at the Config level, currently checking for Legacy Environment only.
+
+Fixes https://github.com/cloudflare/wrangler2/issues/672