test: Disable flakey chain permissions e2e (#12906)

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## **Description**

The purpose of this PR is to disable a couple of chain permission tests
that are flaking as of recently. We aim to renable these tests in
#12872

## **Related issues**

Fixes:

## **Manual testing steps**

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2.
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## **Pre-merge reviewer checklist**

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e2e/specs/multichain/permissions/chains/permission-system-add-non-permitted.spec.js

@@ -102,7 +102,7 @@ describe(
       );
     });
 
-    it('should add network permission when requested', async () => {
+    it.skip('should add network permission when requested', async () => {
       await withFixtures(
         {
           dapp: true,

e2e/specs/multichain/permissions/chains/permission-system-update-permissions.spec.js

@@ -21,7 +21,7 @@ describe(SmokeMultiChainPermissions('Chain Permission Management'), () => {
     jest.setTimeout(150000);
     await TestHelpers.reverseServerPort();
   });
-  it('allows simultaneous granting and revoking of multiple chain permissions', async () => {
+  it.skip('allows simultaneous granting and revoking of multiple chain permissions', async () => {
     await withFixtures(
       {
         dapp: true,