Backslashes in DataTable messes with highlighting

### 👓 What did you see?

I made a .feature file that included a DataTable and Examples table. Some lines had the last several characters uncolored - The lines that had backslashes in them.


### ✅ What did you expect to see?

All the text inside the pipe formatting is colored.

### 📦 Which tool/library version are you using?

Cucumber extension **v1.7.0** for VSCode installed on VS Code v1.74.0

### 🔬 How could we reproduce it?

Steps to reproduce the behavior:
1. Install Cucumber extension v1.7 onto VS Code v.1.74.0
2. Create a file called 'whatever.feature'
3. Write a scenario that includes either DataTable or Examples table
4. Put numerous backslashes inside the table's text

Example:

```gherkin
@BugReport
Feature: BugReport

Scenario: DEID117 Success
Given I submit a bug report

And I put backslashes in a DataTable or Examples table
| this line works fine |
| C:\\Users\\this line won't highlight the last 2 characters |
| I see it with escaped newlines and escaped backslashes. ( \n \n \n \n ) will produce 4 uncolored characters|

Then Cucumber team fixes the highlighting :)
```

Create the reported .feature file in VS Code with DataTable or Examples rows containing backslashes, then reproduce the highlighting failure. Trace the language service's Gherkin table highlighting from that input; done means all text inside the pipe-delimited table is colored, including trailing characters after backslashes.

Written by the indexing model from the issue text.