build(docs-infra): switch from no-op `no-jasmine-focus` tslint rule to `ban` (#29926)

The `no-jasmine-focus` rule has been removed from
`vrsource-tslint-rules` [since version 5.8.0][1] (theoretically;
practically it remained [until version 5.8.2][2]).

This commit removes the non-existent rule (and the obsolete dependency)
and uses tslint's `ban` rule instead (as recommended).

[1]: 477f622cb2 (diff-04c6e90faac2675aa89e2176d2eec7d8R162)
[2]: https://github.com/vrsource/vrsource-tslint-rules/pull/13#issuecomment-442053340

PR Close #29926

aio/package.json

@@ -163,7 +163,6 @@
     "unist-util-source": "^1.0.1",
     "unist-util-visit": "^1.1.1",
     "unist-util-visit-parents": "^1.1.1",
-    "vrsource-tslint-rules": "^5.8.2",
     "watchr": "^3.0.1",
     "xregexp": "^4.0.0",
     "yargs": "^7.0.2"

aio/tslint.json

@@ -6,6 +6,11 @@
   "rules": {
     "array-type": false,
     "arrow-parens": false,
+    "ban": [
+      true,
+      {"name": "fdescribe", "message": "Don't keep jasmine focus methods."},
+      {"name": "fit", "message": "Don't keep jasmine focus methods."}
+    ],
     "component-class-suffix": true,
     "component-selector": [
       true,
@@ -64,7 +69,6 @@
     ],
     "no-input-rename": true,
     "no-inputs-metadata-property": true,
-    "no-jasmine-focus": true,
     "no-output-native": true,
     "no-output-on-prefix": true,
     "no-output-rename": true,

aio/yarn.lock

@@ -10726,11 +10726,6 @@ void-elements@^2.0.0:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/void-elements/-/void-elements-2.0.1.tgz#c066afb582bb1cb4128d60ea92392e94d5e9dbec"
 
-vrsource-tslint-rules@^5.8.2:
-  version "5.8.3"
-  resolved "https://registry.yarnpkg.com/vrsource-tslint-rules/-/vrsource-tslint-rules-5.8.3.tgz#b050f25e5967547a3c5e12539b4530d4d3f0d0e0"
-  integrity sha512-3tYS1zn+d9QtgmQIYmQ9e1i0kipmUjp6cvvYWLC+lZ3z8CQUle7rPKsTFMexOTIVXDpBt9JSJlhDWbwljl3DMQ==
-
 walkdir@^0.0.11:
   version "0.0.11"
   resolved "https://registry.yarnpkg.com/walkdir/-/walkdir-0.0.11.tgz#a16d025eb931bd03b52f308caed0f40fcebe9532"