workspaces: add root prettier and eslint ignores, fix base branch

The root prettier and eslint runs shouldn't reach into the standalone
workspaces, since each one manages its own formatting and linting. Also
correct the ui workspace lint script to diff against origin/master to
match the repo's default branch.

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
Made-with: Cursor

.eslintignore

@@ -8,6 +8,7 @@
 **/public/**
 **/microsite/**
 **/docs-ui/**
+**/workspaces/**
 **/templates/**
 **/sample-templates/**
 playwright.config.ts

.prettierignore

@@ -3,6 +3,7 @@
 .yarn
 dist
 microsite
+workspaces
 docs-ui/.next
 docs-ui/public
 docs-ui/out

workspaces/ui/package.json

@@ -13,7 +13,7 @@
     "test": "backstage-cli repo test",
     "test:all": "backstage-cli repo test --coverage",
     "fix": "backstage-cli repo fix",
-    "lint": "backstage-cli repo lint --since origin/main",
+    "lint": "backstage-cli repo lint --since origin/master",
     "lint:all": "backstage-cli repo lint",
     "prettier:check": "prettier --check .",
     "new": "backstage-cli new"