Fix spec failure in vue3 migration

What does this MR do and why?

resolves #2753 (closed)

In Vue3, a compiled SFC render function is using a _ctx param refer to the context rather than using this in Vue2, so in https://jihulab.com/gitlab-cn/gitlab/-/blob/6f27bb053ef63873e9541e9bdd59bf1368c95a2a/jh/app/assets/javascripts/repository/components/tree_content.vue#L56 , we need to pass this as a param to the original render function

Vue2

    function () {
      var _vm = this
      var _h = _vm.$createElement
      /* istanbul ignore next */
    var _c = _vm._self._c || _h
      return _c(
        "div",
        [
          _c("file-table", {
            attrs: {
              path: _vm.path,
              entries: _vm.entries,
              "is-loading": _vm.isLoadingFiles,
              "loading-path": _vm.loadingPath,
              "has-more": _vm.hasShowMore,
              commits: _vm.commits,
            },
            on: { showMore: _vm.handleShowMore, "row-appear": _vm.handleRowAppear },
          }),
          _vm._v(" "),
          _vm.readme
            ? _c("file-preview", { attrs: { blob: _vm.readme } })
            : _vm._e(),
        ],
        1
      )
    }

Vue3

function render(_ctx, _cache) {
  const _component_file_table = (0, _vue.resolveComponent)('file-table');

  const _component_file_preview = (0, _vue.resolveComponent)('file-preview');

  return (
    (0, _vue.openBlock)(),
    (0, _vue.createElementBlock)('div', null, [
      (0, _vue.createVNode)(
        _component_file_table,
        {
          path: _ctx.path,
          entries: _ctx.entries,
          'is-loading': _ctx.isLoadingFiles,
          'loading-path': _ctx.loadingPath,
          'has-more': _ctx.hasShowMore,
          commits: _ctx.commits,
          onShowMore: _ctx.handleShowMore,
          onRowAppear: _ctx.handleRowAppear,
        },
        null,
        8,
        /* PROPS */
        [
          'path',
          'entries',
          'is-loading',
          'loading-path',
          'has-more',
          'commits',
          'onShowMore',
          'onRowAppear',
        ],
      ),
      (0, _vue.createTextVNode)(),
      _ctx.readme
        ? ((0, _vue.openBlock)(),
          (0, _vue.createBlock)(
            _component_file_preview,
            {
              key: 0,
              blob: _ctx.readme,
            },
            null,
            8,
            /* PROPS */
            ['blob'],
          ))
        : (0, _vue.createCommentVNode)('v-if', true),
    ])
  );
}

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