[ENG] Hreflang Attribute Implementation for Sales, Teamops, Enterprise

## Goal
We would like add hreflang attributes to our Teamops and Sales pages and enterprise - all versions (english, french, german, and japanese)

#### Please provide more information related to this engineering request
Make sure the information you provide is relevant for your request. If unsure, please provide all the fields. Add/remove rows as needed.

## Which page(s) are involved in this request?
- https://about.gitlab.com/teamops/
- https://about.gitlab.com/ja-jp/teamops/
- https://about.gitlab.com/fr-fr/teamops/
- https://about.gitlab.com/de-de/teamops/
- https://about.gitlab.com/sales/
- https://about.gitlab.com/ja-jp/sales/
- https://about.gitlab.com/fr-fr/sales/
- https://about.gitlab.com/de-de/sales/
- https://about.gitlab.com/enterprise/
- https://about.gitlab.com/ja-jp/enterprise/
- https://about.gitlab.com/fr-fr/enterprise/
- https://about.gitlab.com/de-de/enterprise/

## Code to add to each page

The following code must be added to https://about.gitlab.com/teamops/.

```
<link href='https://about.gitlab.com/teamops/' hreflang=x-default rel=alternate />
<link href='https://about.gitlab.com/ja-jp/teamops/' hreflang=ja-jp rel=alternate />
<link href='https://about.gitlab.com/fr-fr/teamops/' hreflang=fr-fr rel=alternate />
<link href='https://about.gitlab.com/fr-fr/teamops/' hreflang=fr rel=alternate />
<link href='https://about.gitlab.com/de-de/teamops/' hreflang=de-de rel=alternate />
<link href='https://about.gitlab.com/de-de/teamops/' hreflang=de rel=alternate />
```

For the language pages eg `/fr-fr/teamops/` the `hreflang` implementation should look like this:

```
<link href='https://about.gitlab.com/teamops/' hreflang=x-default rel=alternate />
<link href='https://about.gitlab.com/ja-jp/teamops/' hreflang=ja-jp rel=alternate />
<link href='https://about.gitlab.com/fr-fr/teamops/' hreflang=fr-fr rel=alternate />
<link href='https://about.gitlab.com/fr-fr/teamops/' hreflang=fr rel=alternate />
<link href='https://about.gitlab.com/de-de/teamops/' hreflang=de-de rel=alternate />
<link href='https://about.gitlab.com/de-de/teamops/' hreflang=de rel=alternate />
```

The same format should be applied to every localized version of our pages.

## In scope
What is within scope of this request?

- [x] hreflang attributes added to /teamops
- [x] hreflang attributes added to /de-de/teamops
- [x] hreflang attributes added to /fr-fr/teamops
- [x] hreflang attributes added to /ja-jp/teamops
- [x] hreflang attributes added to /sales
- [x] hreflang attributes added to /de-de/sales
- [x] hreflang attributes added to /fr-fr/sales
- [x] hreflang attributes added to /ja-jp/sales
- [x] hreflang attributes added to /enterprise
- [x] hreflang attributes added to /de-de/enterprise
- [x] hreflang attributes added to /fr-fr/enterprise
- [x] hreflang attributes added to /ja-jp/enterprise
## DCI
[DRI, Consulted, Informed](https://about.gitlab.com/handbook/people-group/directly-responsible-individuals/#dri-consulted-informed-dci)

- [x] DRI: '@jariasc-ext'
- [ ] Consulted: `@laurenbarker`
- [ ] Informed: `Everyone`

Story points: 1.0